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Help me i have been trying to solve it. plzz

Help me i have been trying to solve it. plzz-example-1

1 Answer

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because completementary angles add up to 180 degrees (angle 3 and angle 4)
and interior angles of a triangle will also add up to 180 degrees

if you compare these two facts, then angle 4 equals the 2 non adjacent interior angles

User JeffG
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