PSLE The perimeter of figure NPQRS is (9
e + 21) cm. The perimeter of square NPQR is 8 cm.
- Find the perimeter of triangle NRS in terms of e.
- The perimeter of figure NPQRS is 93 cm. What is the value of e? 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
= 9
e + 21 - 2 - 2
= (9
e + 17) cm
(b)
9
e + 21 = 93
9
e = 93 - 21
9
e = 72
e = 72 ÷ 9 = 8
Value of
e = 8 cm
Answer(s): (a) (9
e + 17) cm; (b) 8 cm