PSLE The perimeter of figure STUVW is (8
n + 21) cm. The perimeter of square STUV is 16 cm.
- Find the perimeter of triangle SVW in terms of n.
- The perimeter of figure STUVW is 93 cm. What is the value of n? Give your answer in cm.
(a)
Length of the square
= 16 ÷ 4
= 4 cm
Total lengths of ST, TU and UV
= 3 x 4
= 12 cm
Perimeter of triangle SVW
= 8
n + 21 - 4 - 4
= (8
n + 13) cm
(b)
8
n + 21 = 93
8
n = 93 - 21
8
n = 72
n = 72 ÷ 8 = 9
Value of
n = 9 cm
Answer(s): (a) (8
n + 13) cm; (b) 9 cm