New formular in a triangle

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Let $ABC$ be a triangle, the perpendicular bisector of $BC$ meets the circle at $D$, $E$ (see Figure). Then $|AB-AC|=2AD.\sin{\frac{\angle CAB}{2}}$ $|AB+AC|=2AE.\cos{\frac{\angle CAB}{2}}$

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Đào Thanh Oai — July 5, 2022 - 4:01 PM

Resource Type: Activity
Tags: angle circle class collection triangles
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Target Group (Age): 3 – 19+
Language: English

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New formular in a triangle

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