PSLE The perimeter of figure KLMNP is (8
s + 20) cm. The perimeter of square KLMN is 16 cm.
- Find the perimeter of triangle KNP in terms of s.
- The perimeter of figure KLMNP is 92 cm. What is the value of s? Give your answer in cm.
(a)
Length of the square
= 16 ÷ 4
= 4 cm
Total lengths of KL, LM and MN
= 3 x 4
= 12 cm
Perimeter of triangle KNP
= 8
s + 20 - 4 - 4
= (8
s + 12) cm
(b)
8
s + 20 = 92
8
s = 92 - 20
8
s = 72
s = 72 ÷ 8 = 9
Value of
s = 9 cm
Answer(s): (a) (8
s + 12) cm; (b) 9 cm