Mensuration

Hi 3 Express pupils,

Remember this problem that I posed to you?

Scenario

The MRT (Mass Rapid Transit) system forms the backbone of the railway system in Singapore with a network spanning the entire city-state.

The system includes tunnels that run underground.

This is a typical underground MRT tunnel.

To ensure that the trains travel through the tunnel safely, the engineer has to know
(1) the perimeter of the wall,
(2) the cross-sectional area of the tunnel.

Task

Suppose that you are the engineer, how would you find the
(1) the perimeter of the wall, and
(2) the cross-sectional area of the tunnel?

What would you ask so that you will understand the Problem better?
Enter your questions under Comments.