Draw a rectangle 3cm long and 2cm wide. Enlarge the rectangle by 2:1 and draw it. Think about it: what is the area ratio of the two rectangles?

3 × 2 = 6 cm, enlarged length
2 × 2 = 4cm. Enlarged width
The area ratio of the enlarged rectangle to the original rectangle is (6 × 4) ∶ (3 × 2) = 24 ∶ 6 = 4 ∶ 1
It can also be directly calculated by the magnification ratio. 2 & # 178;: 1 & # 178; = 4 ∶ 1

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