PSLE The perimeter of figure STUVW is (5
e + 12) cm. The perimeter of square STUV is 20 cm.
- Find the perimeter of triangle SVW in terms of e.
- The perimeter of figure STUVW is 42 cm. What is the value of e? Give your answer in cm.
(a)
Length of the square
= 20 ÷ 4
= 5 cm
Total lengths of ST, TU and UV
= 3 x 5
= 15 cm
Perimeter of triangle SVW
= 5
e + 12 - 5 - 5
= (5
e + 2) cm
(b)
5
e + 12 = 42
5
e = 42 - 12
5
e = 30
e = 30 ÷ 5 = 6
Value of
e = 6 cm
Answer(s): (a) (5
e + 2) cm; (b) 6 cm