Question

The ratio between a base angle in a Vertical angle of an isosceles triangle is 1 : 4 find each angle of the following

Answer 1

let the base angle be x and vertical angle be 4x. another base angle = x(equal sides have equal angle)


now ,
x+x+4x= 180
6x=180
x=30


therefore,the base angles are 30° each and vertical angle is 4×30= 120 °

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