a = 180-2(70)
a = 40°
a is angle ACB.
b = 180-2a
b = 180-80
b = 100°
b is angle AOC.
Let r be the radius of the circle.
Calculating r.
Observing Cosine Rule.
9² = 2r²-2r²cos100
81 = 2.3472963553r²
r² = 81/2.3472963553
r = √(34.5077858686)
r = 5.874332802 cm.
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