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A right angle triangle can fit into a semi-circle
A semi-circle covers an angle of 180 degrees.
A semi circle is made up of two right angles.
Quadrantal angle
An inscribed angle is an angle formed by two chords in a circle which have a common endpoint. This common endpoint forms the vertex of the inscribed angle.The other two endpoints define an intercepted arc on the circle Any angle inscribed in a semi-circle is a right angle. The proof is simply that the intercepted arc is 180 so the angle must be half of that or 90 degrees.