PSLE The perimeter of figure RSTUV is (9
s + 10) cm. The perimeter of square RSTU is 12 cm.
- Find the perimeter of triangle RUV in terms of s.
- The perimeter of figure RSTUV is 91 cm. What is the value of s? Give your answer in cm.
(a)
Length of the square
= 12 ÷ 4
= 3 cm
Total lengths of RS, ST and TU
= 3 x 3
= 9 cm
Perimeter of triangle RUV
= 9
s + 10 - 3 - 3
= (9
s + 4) cm
(b)
9
s + 10 = 91
9
s = 91 - 10
9
s = 81
s = 81 ÷ 9 = 9
Value of
s = 9 cm
Answer(s): (a) (9
s + 4) cm; (b) 9 cm