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Question

State true or false:
If two lines intersect and if one pair of vertically opposite angles is formed by acute angles, then the other pair of vertically opposite angles will be formed by obtuse angles.

A
True
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B
False
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Solution

The correct option is A True
When two lines intersect, the sum of one angles from both the pairs of vertically opposite angles, is 180
Now, if one pair forms an acute angles, say θ be the acute angle.
Then the other angle formed be ϕ
hence, θ+ϕ=180
ϕ=180θ
But, θ is an acute angle, hence ϕ is an obtuse angle.
hence, the other pair of vertically opposite angles will be formed by obtuse angles.

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