PSLE The perimeter of figure FGHJK is (7
p + 19) cm. The perimeter of square FGHJ is 20 cm.
- Find the perimeter of triangle FJK in terms of p.
- The perimeter of figure FGHJK is 68 cm. What is the value of p? Give your answer in cm.
(a)
Length of the square
= 20 ÷ 4
= 5 cm
Total lengths of FG, GH and HJ
= 3 x 5
= 15 cm
Perimeter of triangle FJK
= 7
p + 19 - 5 - 5
= (7
p + 9) cm
(b)
7
p + 19 = 68
7
p = 68 - 19
7
p = 49
p = 49 ÷ 7 = 7
Value of
p = 7 cm
Answer(s): (a) (7
p + 9) cm; (b) 7 cm