Isosceles triangle 8

If the rate of the sides of an isosceles triangle is 7:6:7, find the base angle correct to the nearest degree.

Correct answer:

B =  64.6 °

Step-by-step explanation:

a:b= 7:6 a=7 b=6  cos B = b/2 : a  B=π180°arccos(ab/2)=π180°arccos(76/2)=64.6=64°3723"

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