Mathematics for IGCSE & O level - Ratio And Proportion (Section 3 - No. 36)
The ratio of the sides of a triangle is 2:5:6. The perimeter is 39 cm. Find the length of longest side.
6cm
13cm
18cm
26cm
คำอธิบาย
2+5+6 = 13. 39/13 = 3, so longest is 6*3 = 18