What is the area of the shape ?

a) 3 sq cm
b) 4 sq cm
c) 6 sq cm
d) 9 sq cm

Step-by-step explanation:

Look at the picture.

The formula of an area of a rectangle:

A = wl

w - width, l - length

We have two rectangles:

Rectangle 1:

1cm × 2cm

A₁ = 1cm × 2cm = 2cm²

Rectangle 2 (square):

1cm × 1cm

A₂ = 1cm × 1cm = 1cm²

The area of a shape:

A = A₁ + A₂ → A = 2cm² + 1cm² = 3cm²

The submarine needs to move up, so the rate the submarine needs to move is positive.