Question

what is the other name for ∠abc or ∠cba?

1. ∠b
2. ∠c
3. ∠a
4. ∠t

o 1
o 2
o 3
o 4

Explanation:

When naming an angle, if there is only one angle at a vertex, it can be named by the vertex - letter. Here, the vertex of the angle is B. Also, the angle is marked as ∠t. So, ∠ABC or ∠CBA can also be named as ∠B or ∠t.

Answer:

1. ∠B
2. ∠t