A rectangular-based pyramid is cut horizontally, leaving the frustum and the pyramid shown below. Work out the volume of the fru
stum. Give your answer in cm", and give any decimal answers to 1 d.p. 
1 answer:
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Hi there!
∠C = 40° and triangle ABC is isosceles, therefore:
∠C = ∠A = 40°
Angles in a triangle sum up to 180°, so:
180 = 40 + 40 + ∠A
180 = 80 + ∠A
100 = ∠A
Thus, arc CB has a measure of 100°.