Look at the rectangle ABCD below.
Side AB is 4.5 cm long and side BC is 2 cm long.
What is the area of the rectangle?
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Look at the rectangle ABCD below.
Side AB is 4.5 cm long and side BC is 2 cm long.
What is the area of the rectangle?
We begin by multiplying side AB by side BC
We then substitute the given data and we obtain the following:
Hence the area of rectangle ABCD equals 9
9 cm²
Look at the rectangle below.
Side DC has a length of 1.5 cm and side AD has a length of 9.5 cm.
What is the perimeter of the rectangle?
Adding gives you the perimeter (distance around), but area measures the space inside. Think of tiling: you need 4.5 × 2 = 9 square tiles to fill this rectangle!
For rectangles, it doesn't matter! Length × width gives the same result as width × length. Just pick any two adjacent sides (sides that meet at a corner).
Area is always measured in square units! When you multiply cm × cm, you get cm². This tells us we're measuring a 2-dimensional space, not just a length.
Think of 4.5 as 4½. So 4½ × 2 = (4 × 2) + (½ × 2) = 8 + 1 = 9. Or use
The method stays the same! Always use Area = length × width. Whether the sides are 3 cm and 7 cm, or 2.8 cm and 5.1 cm, just multiply them together.
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