3 years ago

If ∠C and ∠D are vertical angles and m∠C=x and m∠D=−3x+80, what is m∠C?

Mathematics

1 answer:

Rufina [12.5K]3 years ago

7 0

Vertical angles are equal to each other, so:

$x=-3x+80

4x=80

\tfrac{80}{4} = x

x=20$

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