PSLE The perimeter of figure HJKLM is (8
g + 17) cm. The perimeter of square HJKL is 20 cm.
- Find the perimeter of triangle HLM in terms of g.
- The perimeter of figure HJKLM is 81 cm. What is the value of g? Give your answer in cm.
(a)
Length of the square
= 20 ÷ 4
= 5 cm
Total lengths of HJ, JK and KL
= 3 x 5
= 15 cm
Perimeter of triangle HLM
= 8
g + 17 - 5 - 5
= (8
g + 7) cm
(b)
8
g + 17 = 81
8
g = 81 - 17
8
g = 64
g = 64 ÷ 8 = 8
Value of
g = 8 cm
Answer(s): (a) (8
g + 7) cm; (b) 8 cm