Mathematics for IGCSE & O level - Mensuration (Section 12 - No. 43)
A rectangle has a perimeter of 40 cm. If its width is 8 cm, what is its length?
5 cm
12 cm
16 cm
24 cm
解释
Perimeter = 2*(length + width). 40cm = 2 *(length + 8cm). length = (40/2) - 8 = 12 cm.