PSLE The perimeter of figure KLMNP is (7
e + 23) cm. The perimeter of square KLMN is 20 cm.
- Find the perimeter of triangle KNP in terms of e.
- The perimeter of figure KLMNP is 86 cm. What is the value of e? 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
= 7
e + 23 - 5 - 5
= (7
e + 13) cm
(b)
7
e + 23 = 86
7
e = 86 - 23
7
e = 63
e = 63 ÷ 7 = 9
Value of
e = 9 cm
Answer(s): (a) (7
e + 13) cm; (b) 9 cm