Mathematics for IGCSE & O level - Ratio And Proportion (Section 4 - No. 32)
The ratio of the sides of a rectangle is 2:3. If the perimeter is 40 cm, what is the length of the shorter side?
4 cm
8 cm
12 cm
16 cm
คำอธิบาย
Perimeter is 2(2x + 3x) = 10x. 10x = 40, x = 4. Shorter side is 2x = 8cm.