Mathematics for IGCSE & O level - Ratio And Proportion (Section 6 - No. 14)
The ratio of the sides of a triangle is 2:3:4. If the perimeter of the triangle is 45 cm, what is the length of the shortest side?
5 cm
10 cm
15 cm
20 cm
คำอธิบาย
2x+3x+4x=45, 9x = 45, x=5, hence the shortest side 2x = 10cm.