Question

the angle ar the vertex of an isosceles triangle is 100 degree.Find it's base angle​

Answer 1

Step-by-step explanation:

Answer. the base angle will be (180° - 100°) = 80°.

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Answer 2

Answer:

let the triangle be ABC

and the equal sides be AB&AC

now a AB &AC are equal then angle ABC =angleACB (angles opposite to equal sides are equal )

let equal angles be named as x

now ,(by angle sum property)

100+x+x=180

100+2x=180

2x=180-100

2x=80

now,x=40

so the both base angles are 40

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