Question

Please help asap!!

What is the measure of angle B in this triangle?

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Answer 1

x = 50

∠B = 70°

Explanation:

The sum of interior angles in a triangle is equal to 180 so to find the value of x we can use the following equation:

40 + x + 20 + 2x - 30 = 180 add like terms

3x + 30 = 180 subtract 30 from both sides

3x = 150 divide both sides by 3

x = 50 to find the angle measures replace x with 50 in each expression.

∠B = 2×50 - 30

∠B = 70°