Question

The equal angles of an isosceles triangle are x° each.Find the third angle

Answer 1

Answer:

180-2x

Step-by-step explanation:

sum of all angles of triangle=180

1st angle+2nd angle+3rd angle=180

2 angles=x°each

so,x+x+3rd angle=180

2x+3rd angle=180

3rd angle=180-2x

                 

Answer 2

Answer:

( 180° - 2x° )

Given:

• The triangle is an isosceles triangle.
• Measure of equal angles is x°

To Find:

• The third angle

Solution:

Let the third angle = a

Sum of all angles of a triangle is 180°

x° + x° + a = 180°

2x° + a = 180°

a = 180° - 2x°

( 180° - 2x° ) is the measure of the third angle.

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An isosceles triangle have two equal sides.

Let the base be the unequal side, then the measure of both base angles will be same