Question

The perimeter of the new triangle (P'Q'R') obtained on rotating the triangle PQR by 90° anticlockwise over origin is as that of the triangle PQR.

• A. half
• B. twice
• C. one-fourth
• D. same

Answer 1

The correct option is D same

The new triangle(P'Q'R') obtained on rotating the triangle (PQR) by 90° anticlockwise over origin is given by:


Here, we can see the dimensions of the new triangle does not change.

∴ Perimeter of triangle P'Q'R = Perimeter of triangle PQR