PSLE The perimeter of figure RSTUV is (9
x + 13) cm. The perimeter of square RSTU is 12 cm.
- Find the perimeter of triangle RUV in terms of x.
- The perimeter of figure RSTUV is 94 cm. What is the value of x? 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
x + 13 - 3 - 3
= (9
x + 7) cm
(b)
9
x + 13 = 94
9
x = 94 - 13
9
x = 81
x = 81 ÷ 9 = 9
Value of
x = 9 cm
Answer(s): (a) (9
x + 7) cm; (b) 9 cm