 Page 2 A = L x W Example 1: 
A = L x W A = 20 x 7 A = 140 cm2 We no longer have to draw all the squares and count them. Example 2: "Find the area of a rectangle with length 15 cm and width 4 cm" A = L x W A = 15 x 4 A = 60 cm2 We don't need any diagram at all! We can find the area using other units. One square metre is a large area 100 cm x 100 cm One square metre would be the same as 10,000 square centimetres. But we don't need to know that to do the questions. Example 3: Here's one measured in metres: 
A = L x W A = 15 x 15 A = 225 m2 Example 4: This one is in millimetres: 
A = L x W A = 100 x 25 A = 2,500 mm2 As long as the units for length and width are the same, we just multiply them. We can also solve questions backwards. Example 5: "A rectangular patio has area 48 m2. Its length is 16 m. How wide is it?" A = L x W 48 = 16 x W 48/16 = W 3 = W The width is 3 m. |