<div><div><img alt="Cho hình vẽ bên. Số đo góc ADC bằng bao nhiêu độ (ảnh 1)" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762149976.png"/></div><p 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" style="margin-left: -5.4pt; text-align: justify; mso-pagination: none; margin-top: 0pt; margin-bottom: 0pt; tab-stops: 1.000125cm 5.000624999999999cm 9.001124999999998cm 13.001624999999999cm; border: none; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: none; mso-border-bottom-alt: none; mso-border-between: none;">Đáp số: 80.<p style="margin-left: -5.4pt; text-align: justify; mso-pagination: none; margin-top: 0pt; margin-bottom: 0pt; tab-stops: 1.000125cm 5.000624999999999cm 9.001124999999998cm 13.001624999999999cm; border: none; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: none; mso-border-bottom-alt: none; mso-border-between: none;">Xét đường tròn <img height="28" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762150036.png" style="max-width: 100%;" width="36"/> ta có <img height="27" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762150096.png" style="max-width: 100%;" width="130"/> (hai góc nội tiếp cùng chắn cung <img height="26" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762150156.png" style="max-width: 100%;" width="36"/><p style="margin-left: -5.4pt; text-align: justify; mso-pagination: none; margin-top: 0pt; margin-bottom: 0pt; tab-stops: 1.000125cm 5.000624999999999cm 9.001124999999998cm 13.001624999999999cm; border: none; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: none; mso-border-bottom-alt: none; mso-border-between: none;">Tứ giác <img height="20" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762150216.png" style="max-width: 100%;" width="51"/>nội tiếp đường tròn nên <img height="27" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762150276.png" style="max-width: 100%;" width="132"/><div><p class="docData;DOCY;v5;1708;BQiAAgAAEYQCAAAGiAIAAAMQBgAABR4GAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAhAMAAAB/AwAAAYIAAAABBgAAAAAJBgAAAAAZAQARBkgAAAASBgwAAAArAQgqBDcCAAAjAQQSBgwAAAArAQgqBBMLAAAjAQQSBgwAAAArAQgqBO8TAAAjAQQSBgwAAAArAQgqBMscAAAjAQQaBhkAAAAUAQEWBBgAAAAZBgoAAABuAGwALQBOAEwAGwYAAAAAAvMCAAAFJgAAAAEJAAAAFAEBFgQYAAAACBMAAAAADgAAAFMAdQB5ACAAcgBhACAABXMCAAABDwAAACcE7P///xQBARYEGAAAAAhaAgAADFUCAAAAAQAOBgwAAAACBBZxQQADBMvQBAANBhgAAAAEBAAAAAAFBAAAAAAGBAAAAAAHBAAAAAAeBgAAAAAfBiYAAAAABAAAACeVex4BGAAAAF8AeAAwADAAMAAwAF8AaQAxADMAMwAyAAEG6gEAAADlAQAAAeABAAAG2wEAAAROAAAA+gAOAAAARQBxAHUAYQB0AGkAbwBuAC4ARABTAE0AVAA0AAJmGgAAAwgCAAAEAAUABwwAAABtAGEAcwBrAEYAaQBsAGUALgBiAGkAbgD7ABgAAAAADAAAAPoAVjo0LQEAAAAA+wICAAAA+vsBAgEAAAH9AAAA+vsA8QAAAPr7AgQAAAAAAAAAA+EAAAD6AG0AAABmAGkAbABlADoALwAvAC8AQwA6AC8AVQBzAGUAcgBzAC8AQQBkAG0AaQBuAC8AQQBwAHAARABhAHQAYQAvAEwAbwBjAGEAbAAvAE8ATgBMAFkATwBGAEYASQBDAEUALwBEAGUAcwBrAHQAbwBwAEUAZABpAHQAbwByAHMALwBkAGEAdABhAC8AcgBlAGMAbwB2AGUAcgAvAEQARQBfADUANAAxAC8AbQBlAGQAaQBhAC8AZABpAHMAcABsAGEAeQA1AGkAbQBhAGcAZQAzADEANAAuAHMAdgBnAPsDAAAAAAJfAAAA+gAA+wAWAAAA+gAAAAAAAQAAAAACFnFBAAPL0AQA+wEUAAAAAQ8AAAD6AAQAAAByAGUAYwB0APsCBQAAAAIAAAAAAxgAAAD6+wAFAAAAAgAAAAACBwAAAPoAAAAAAPsFIwAAAAEZAAAAFAEBFgQYAAAAGQYKAAAAbgBsAC0ATgBMAAgAAAAABSMAAAABGQAAABQBARYEGAAAABkGCgAAAG4AbAAtAE4ATAAIAAAAAAoAAAAAAAAAABEAAAAAigAAAAAtAAAAAQYAAAAACQYbAAAAJwQDAQAACwEBHAEAKAQAAAAAHQEAKQSgAAAAGwYAAAAAAU4AAAAoAQcpAQcqAQcrAQUTAQEIBBYAAAAWBBYAAAAZBgoAAABlAG4ALQBVAFMAGgYKAAAAYQByAC0AUwBBABsGCgAAAGUAbgAtAFUAUwAuAQMCAAAAAA==" style="text-align: justify; mso-pagination: none; margin-top: 0pt; margin-bottom: 0pt; tab-stops: 1.000125cm 5.000624999999999cm 9.001124999999998cm 13.001624999999999cm; border: none; mso-border-between: none;">Suy ra <img height="36" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762150336.png" style="max-width: 100%;" width="453"/></div></div>

<div><div><img alt="Chúng minh C, B, F thẳng hàng (ảnh 1)" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762156396.png"/></div><p class="docData;DOCY;v5;7540;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style="margin-left: -5.4pt; text-align: justify; mso-pagination: none; margin-top: 0pt; margin-bottom: 0pt; tab-stops: 1.000125cm 5.000624999999999cm 9.001124999999998cm 13.001624999999999cm; border: none; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: none; mso-border-bottom-alt: none; mso-border-between: none;">Xét đường tròn <img height="31" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762156456.png" style="max-width: 100%;" width="32"/> có <img height="23" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762156516.png" style="max-width: 100%;" width="32"/> là đường kính nên <img height="27" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762156576.png" style="max-width: 100%;" width="78"/> (góc nội tiếp chắn nửa đường tròn).<p style="margin-left: -5.4pt; text-align: justify; mso-pagination: none; margin-top: 0pt; margin-bottom: 0pt; tab-stops: 1.000125cm 5.000624999999999cm 9.001124999999998cm 13.001624999999999cm; border: none; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: none; mso-border-bottom-alt: none; mso-border-between: none;">Xét đường tròn <img height="31" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762156636.png" style="max-width: 100%;" width="35"/> có <img height="20" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762156696.png" style="max-width: 100%;" width="32"/> là đường kính nên <img height="27" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762156756.png" style="max-width: 100%;" width="78"/> (góc nội tiếp chắn nửa đường tròn).<p style="margin-left: -5.4pt; text-align: justify; mso-pagination: none; margin-top: 0pt; margin-bottom: 0pt; tab-stops: 1.000125cm 5.000624999999999cm 9.001124999999998cm 13.001624999999999cm; border: none; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: none; mso-border-bottom-alt: none; mso-border-between: none;">Do đó <img height="27" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762156816.png" style="max-width: 100%;" width="256"/><p style="margin-left: -5.4pt; text-align: justify; mso-pagination: none; margin-top: 0pt; margin-bottom: 0pt; tab-stops: 1.000125cm 5.000624999999999cm 9.001124999999998cm 13.001624999999999cm; border: none; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: none; mso-border-bottom-alt: none; mso-border-between: none;">Suy ra ba điểm <img height="24" src="https://daythem.com/public/s3/user.editor.image/2025/11/user-system-generate/7b968fe0-40a7-4447-a928-02f1dccf3f24/1762156876.png" style="max-width: 100%;" width="59"/> thẳng hàng.</div>

Bộ đề thi giữa kì 2 Toán 9 có đáp án - Đề 02