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Ayushree
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Asked: 2026-08-13T05:05:50+00:00 In:

How would you use the following figure to justify the statement that the angle in a semicircle is 90°?

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In the figure, the diameter passes through O and A lies on the semicircle. Since OA, OB and OC are radii, the relevant triangles are isosceles. Their angles show that a + b = 90°, so the angle at A is 90°.

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