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Answer:
Step-by-step explanation:
AB is shown as a diameter, which means that inscribed angle C is a right angle. The length of the diameter can be found from the Pythagorean theorem to be ...
AB^2 = AC^2 + BC^2
AB = √(5^2 +12^2) = 13
The radius is half the length of the diameter, so is ...
OA = 13 cm/2 = 6.5 cm . . . . radius
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The measure of inscribed angle B is half the measure of arc AC, so is ...
∠B = 45.2°/2 = 22.6°
The measure of angle OAC is the complement of this, so is ...
∠OAC = 90° -22.6°
∠OAC = 67.4°
