A geometric theorem works about 5 theory 1. in any of the circles were divided into two equal parts by a diameter.2. angle at the base of an isosceles triangle are equal in value.3. the two intersecting straight lines. Opposite angles are equal, that inevitably occur.4. the two triangles. If there are two equal angles and sides of the triangle are equal both are similar.5. angle inside the semicircle is a right angle.
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