![]() The intersection of the diameter and the chord at 90 degrees can be very close to the centre and so the two lengths coming from the point of intersection to the radius are assumed to be equal, but they aren’t. Incorrect assumption of isosceles triangles.This also includes the inverse trigonometric functions. The incorrect trigonometric function is used and so the side or angle being calculated is incorrect. The missing side is calculated by incorrectly adding the square of the hypotenuse and a shorter side, or subtracting the square of the shorter sides. The only case of this is when both angles are 90^o. ![]()
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