In parallelogram ABCD, angle A is greater than angle B by 10°, then measure of angle D is
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 85°
In a parallelogram, adjacent angles add up to 180° and opposite angles are equal. Angle D is opposite angle B, so it equals angle B.
Let \(\angle B=x\); then \(\angle A=x+10\)
\(x+(x+10)=180\), so \(2x=170\) and \(x=85^\circ\)
\(\angle D=\angle B=85^\circ\)
