Question

Triangle ABC is shown below, with the angle measures as marked

Select all statements that are correct.

Answer 1

Angle A = 54°

Explanation:

The sum of interior angles in a triangle is equal to 180°.

• Write all measurements.

3n - 10 + n + 20 + n = 180

• Add like terms.

5n + 10 = 180

• Subtract 10 from both sides.

5n = 170

• Divide both sides by 5.

n = 34

Now, we need to to replace n with 34:

Angle C = 34°,

Angle A = 54°,

Angle B = 92°.

So only 2nd statement is true.