PSLE The perimeter of figure NPQRS is (6
c + 12) cm. The perimeter of square NPQR is 8 cm.
- Find the perimeter of triangle NRS in terms of c.
- The perimeter of figure NPQRS is 30 cm. What is the value of c? Give your answer in cm.
(a)
Length of the square
= 8 ÷ 4
= 2 cm
Total lengths of NP, PQ and QR
= 3 x 2
= 6 cm
Perimeter of triangle NRS
= 6
c + 12 - 2 - 2
= (6
c + 8) cm
(b)
6
c + 12 = 30
6
c = 30 - 12
6
c = 18
c = 18 ÷ 6 = 3
Value of
c = 3 cm
Answer(s): (a) (6
c + 8) cm; (b) 3 cm