Ratio iso triangle

The ratio of the sides of an isosceles triangle is 7:6:7. Find the base angle to the nearest answer correct to 3 significant figures.

Correct answer:

α =  64.6231 °

Step-by-step explanation:

a:c:b = 7:6:7 a=7 b=7 c=6  x=c/2=6/2=3  cos α = x:b  α=π180°arccos(bx)=π180°arccos(73)=64.6231=64°3723"

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