PSLE The perimeter of figure FGHJK is (4
d + 18) cm. The perimeter of square FGHJ is 24 cm.
- Find the perimeter of triangle FJK in terms of d.
- The perimeter of figure FGHJK is 54 cm. What is the value of d? Give your answer in cm.
(a)
Length of the square
= 24 ÷ 4
= 6 cm
Total lengths of FG, GH and HJ
= 3 x 6
= 18 cm
Perimeter of triangle FJK
= 4
d + 18 - 6 - 6
= (4
d + 6) cm
(b)
4
d + 18 = 54
4
d = 54 - 18
4
d = 36
d = 36 ÷ 4 = 9
Value of
d = 9 cm
Answer(s): (a) (4
d + 6) cm; (b) 9 cm