The side of a regular octagon is half the side of a regular quadrilateral (square). If the perimeter of the quadrilateral is 20 cm, what is the perimeter of the octagon?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 20 cm.
Side of square = 20/4 = 5 cm
Side of octagon = 5/2 = 2.5 cm
Perimeter of octagon = 8 × 2.5 = 20 cm