kim2001 kim2001

15-05-2017
Mathematics

contestada

If m∠4 = (3x)° and m∠8 = (x + 40)°, what is the measure of ∠4?
∠4 and ∠8 are vertical.

A.
20˚
B.
60˚
C.
40˚
D.
120˚

Respuesta :

lizzyvet1 lizzyvet1

15-05-2017

vertical angles are opposite angles and therefore equal
3x = x + 40
-x -x
2x = 40
--- -----
2 2
x = 20

A is your answer

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