Point O is the center of the circle in the diagram. What is m. BCA?
A.
80°
B.
75°
C.
70°
D.
65°
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reserved.

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.

c

step-by-step explanation: