Question

Solve for x.

which option below is correct?

Answer 1

Explanation:

This is a triangle which has three sides.

Finding sum of the interior angle of a triangle

s = n-2×180

n = number of sides

s = sum of the interior angle

s = 3-2×180

s = 1×180

s= 180°

Therefore the sum of the interior angle of a triangle is 180°.

Solution

5x + 130 + 20 = 180

5x = 180 - 150

5x = 30

Divide both sides by 5

x = 6

Answer: A) 6