Circumference 4430

In an isosceles triangle with a circumference of 36 cm, the height at the base is 12 cm long. Calculate the length of the arm of a given triangle.

Correct answer:

r =  13 cm

Step-by-step explanation:

o=36 cm h=12 cm  o = 2r+a  h2 = r2(a/2)2 122 = r2((362r)/2)2 144 = r2(18r)2 144 = r2(1822 18r+r2) 36r+468=0  r=468/36=13 cm

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