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Inscribed Angle Circle Calculator . Try it here (not always. In an inscribed circle, radius always meets a tangent at right angle. Question Video Finding the Measure of an Inscribed Angle given That from www.nagwa.com An inscribed angle in a circle is formed by two chords that have a common end point on the circle. This common end point is the vertex of the angle. A = r² * θ / 2 = 15² * π/4 / 2 = 88.36 cm².