PSLE The perimeter of figure NPQRS is (10
s + 21) cm. The perimeter of square NPQR is 24 cm.
- Find the perimeter of triangle NRS in terms of s.
- The perimeter of figure NPQRS is 91 cm. What is the value of s? Give your answer in cm.
(a)
Length of the square
= 24 ÷ 4
= 6 cm
Total lengths of NP, PQ and QR
= 3 x 6
= 18 cm
Perimeter of triangle NRS
= 10
s + 21 - 6 - 6
= (10
s + 9) cm
(b)
10
s + 21 = 91
10
s = 91 - 21
10
s = 70
s = 70 ÷ 10 = 7
Value of
s = 7 cm
Answer(s): (a) (10
s + 9) cm; (b) 7 cm