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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