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we are given

The angle is at right angled

It means that it's angle will be 90 degree

Since, these angles are part of right angle

so, their sum must be 90 degree

so, we get

now, we can solve for a

divide both sides by 7

and we get

.............Answer

we are given

The angle is at right angled

It means that it's angle will be 90 degree

Since, these angles are part of right angle

so, their sum must be 90 degree

so, we get

now, we can solve for a

divide both sides by 7

and we get

.............Answer

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