Question

If angle C is 48 and angle B is 11x-5 and angle A is 9x-3, Find angle A.

Answer 1

60°

Explanation:

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

• To find the measure of m∠A, we can write the following equation based on the above mentioned information:

48° + 11x - 5 + 9x - 3 = 180°

• Add like terms.

40° + 20x = 180°

• Subtract 40 from both sides.

20x = 140°

• Divide both sides with 20.

x = 7

To find m∠A, replace x with 7:

m∠A = 9x - 3

9×7-3 = 60°