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 figure.

Correct result:

A =  64.6231 °

Solution:

a=6/2=3 b=7 A=180πarccos(ab)=180πarccos(37)=64.6231=643723"

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