Question

In an isosceles triangle the base angle are equal .the vertex angle is 40°what the base angle of the triangle?
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Answer 1

Answer:

base angles are 70 degree each

Step-by-step explanation:

let base angle be x

so =x+x40 =180degree

2x =180-40

2x=140

x=70

so each base angles are 70degree

Answer 2

Answer:

The base angles of the triangle are 40°

Step-step explanation :

As the base angles of any triangles are equal.

So let the base angles be x

∴ x +x + 40° = 180° ( sum of all angles of a triangle= 180°)

∴   2x + 40° = 180°  

∴             2x = 180 -40  

∴             2x = 140

∴               x = 140/2

∴               x = 70

∴The base angles of the triangle are 40°