PSLE The perimeter of figure KLMNP is (5
y + 14) cm. The perimeter of square KLMN is 24 cm.
- Find the perimeter of triangle KNP in terms of y.
- The perimeter of figure KLMNP is 54 cm. What is the value of y? Give your answer in cm.
(a)
Length of the square
= 24 ÷ 4
= 6 cm
Total lengths of KL, LM and MN
= 3 x 6
= 18 cm
Perimeter of triangle KNP
= 5
y + 14 - 6 - 6
= (5
y + 2) cm
(b)
5
y + 14 = 54
5
y = 54 - 14
5
y = 40
y = 40 ÷ 5 = 8
Value of
y = 8 cm
Answer(s): (a) (5
y + 2) cm; (b) 8 cm