Question

What is angle CBD
A=60
D=80
C=25

Answer 1

m∠CBD = 55°

Explanation:

Angles BDA and BDC form a linear pair:

⇒ m∠BDA + m∠BDC = 180°

⇒ 80° + m∠BDC = 180°

⇒ m∠BDC = 100°

Interior angles of a triangle sum to 180°:

⇒ m∠CBD + m∠BDC + m∠DCB = 180°

⇒ m∠CBD + 100° + 25° = 180°

⇒ m∠CBD + 125° = 180°

⇒ m∠CBD = 55°