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Sum of Angles of a Polygon

If the interi...

Question

If the interior angles of a triangle are (x - 20)°, (2x - 10)°, and (x + 50)°, find the value of x.
40

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Solution

The correct option is A 40
Given: (x - 20)°, (2x - 10)°, and (x + 50)°

We know that sum of all the interior angles of a triangle is 180°.

So, (x - 20)°+ (2x - 10)°+ (x + 50)° = 180°
4x + 20 = 180
4x = 160
x = 40

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