Question

If mzABD = 100° and mZDBC = 30°,
then mZABC = [? ]°

Answer 1

130°

Explanation:

Given: m<ABD=100° and m<DBC=30°

To find m<ABC, we must add up the two other angles.

100°+30°=130°

Hope this helped :D

Answer 2

Answer: 130°

Explanation:

∠ABD = 100° (given)

∠DBC = 30° (given)

Angle Addition Postulate states: ∠ABD + ∠DBC = ∠ABC

100° + 30° = ∠ABC

130° = ∠ABC