Question

Which of these angles are complementary?
A99º

B81º

C57º

D33º
Angle and angle are complementary angles.

Answer 1

Two angles are considered complementary if the sum of their measures equals 90 degrees.

Let's evaluate the given angles:

- Angle A: 99º
- Angle B: 81º
- Angle C: 57º
- Angle D: 33º

Now, let's find pairs that sum to 90:

1. **A (99º)** - Not complementary with any angle since it's already greater than 90º.
2. **B (81º)** + **D (33º)** = 81º + 33º = 114º (not complementary)
3. **B (81º)** + **C (57º)** = 81º + 57º = 138º (not complementary)
4. **C (57º)** + **D (33º)** = 57º + 33º = 90º (complementary)

Thus, Angle C (57º) and Angle D (33º) are complementary angles.

So, the answer is:
**C and D are complementary angles.**