Question

7 ABCD is a parallelogram. If its diagonals are equal, then find the value of ∠ABC ?
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Answer 1

Answer:

In a parallelogram if two diagonals are equal, then the parallelogram is a rectangle.So, ABCD is a rectangle.It is known that each interior angle of a rectangle is 90 degree. Since ABC is an interior angle of rectangle ABCD, so measure of angle ABC is 90 degree.