Question

Solve no.5th in the copy.Its urgent.

Answer 1

Given that ABCD is a parallelogram.

Then it says two diagonals are equal.

Remember that parallelogram becomes Rectangle when diagonals become equal.

So now ABCD is a rectangle.

By property of rectangle we know that ABCD will have all angles equal to each other and all are equal to 90 degree.

∠ABC is an angle of rectangle ABCD so that will be equal to 90°

Hence the final answer is ∠ABC=90°