PSLE The perimeter of figure RSTUV is (4
c + 18) cm. The perimeter of square RSTU is 12 cm.
- Find the perimeter of triangle RUV in terms of c.
- The perimeter of figure RSTUV is 46 cm. What is the value of c? 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
= 4
c + 18 - 3 - 3
= (4
c + 12) cm
(b)
4
c + 18 = 46
4
c = 46 - 18
4
c = 28
c = 28 ÷ 4 = 7
Value of
c = 7 cm
Answer(s): (a) (4
c + 12) cm; (b) 7 cm