Question

Use the relationship between supplementary angles ∠a
and ∠b
. What is m∠a
if m∠b=121°
?(1 point)
Responses

301°
301 degrees

31°
31 degrees

121°
121 degrees

59°

Answer 1

Supplementary angles are two angles whose measures add up to 180 degrees. Given that m∠b = 121°, you can find m∠a using the equation:

m∠a + m∠b = 180°

Now, substitute the value of m∠b into the equation:

m∠a + 121° = 180°

To find m∠a, subtract 121° from both sides:

m∠a = 180° - 121°
m∠a = 59°

So, the correct answer is **59°**.