PSLE The perimeter of figure FGHJK is (7
p + 19) cm. The perimeter of square FGHJ is 8 cm.
- Find the perimeter of triangle FJK in terms of p.
- The perimeter of figure FGHJK is 82 cm. What is the value of p? Give your answer in cm.
(a)
Length of the square
= 8 ÷ 4
= 2 cm
Total lengths of FG, GH and HJ
= 3 x 2
= 6 cm
Perimeter of triangle FJK
= 7
p + 19 - 2 - 2
= (7
p + 15) cm
(b)
7
p + 19 = 82
7
p = 82 - 19
7
p = 63
p = 63 ÷ 7 = 9
Value of
p = 9 cm
Answer(s): (a) (7
p + 15) cm; (b) 9 cm