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. same
• C. twice
• D. one-fourth

Answer 1

The correct option is B 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