A right angle triangle can fit into a semi-circle
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A semi-circle covers an angle of 180 degrees.
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.
An inscribed angle is an angle with its vertex on a circle and with sides that contain chords of the circle.
An inscribed angle.
An arc.