An isosceles triangle of sides 13cm, 13cm, 10cm is inscri...
An isosceles triangle of sides 13cm, 13cm, 10cm is inscribed in a circle. What is the radius of the circle?
7cm
12cm
8cm
36cm
69cm
Correct answer is A
In ΔDAC,⌢DAC=θ
sinθ=513
\theta = 22.6°
< DOC = 22.6° \times 2 = 45.2°
\sin 45.2 = \frac{5}{r} \implies r = \frac{5}{\sin 45.2}
r = 7.046cm
= 7\frac{1}{24} cm
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