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15 votes
Supplementary angles

A
always add up to 180 degrees.

B
always add up to 90 degrees.

C
are across from each other.

D
are congruent.

User EtienneT
by
3.2k points

1 Answer

10 votes

Answer:

a

Explanation:

supplementary angles touch and there bases together are a strait line.

Supplementary angles A always add up to 180 degrees. B always add up to 90 degrees-example-1
User Exploding Kitten
by
4.1k points