IMAS 2024–2025 — Middle Primary — First Round Question 12

In the diagram below, there is an octagon ABCDEFGH, where every pair of adjacent edges meet at a right angle. It is known that $BC=24$ cm, $CD=26$ cm and $GH=17$ cm. What is the perimeter, in cm, of octagon ABCDEFGH?

Note: The diagram is NOT drawn to scale.