PSLE The perimeter of figure KLMNP is (10
c + 20) cm. The perimeter of square KLMN is 20 cm.
- Find the perimeter of triangle KNP in terms of c.
- The perimeter of figure KLMNP is 110 cm. What is the value of c? Give your answer in cm.
(a)
Length of the square
= 20 ÷ 4
= 5 cm
Total lengths of KL, LM and MN
= 3 x 5
= 15 cm
Perimeter of triangle KNP
= 10
c + 20 - 5 - 5
= (10
c + 10) cm
(b)
10
c + 20 = 110
10
c = 110 - 20
10
c = 90
c = 90 ÷ 10 = 9
Value of
c = 9 cm
Answer(s): (a) (10
c + 10) cm; (b) 9 cm