Question

If ∠a = 50°, what does ∠b equal?

Answer 1

∠b = 40°

Explanation:

50 + (∠b) = 90

subtract 50 from both sides

∠b = 40°

That is a right angle which is equivalent to 90°

and if ∠a is 50° then the other angle has to be 40°

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Answer 2

m∠b = 40°

Explanation:

∠a and ∠b are complementary angles. Complementary angles form a right angle and have a sum of 90°.

Therefore we have the equation:

m∠a + m∠b = 90°

Substitute m∠a = 50°:

50° + m∠b = 90° subtract 50° from both sides

m∠b = 40°