PSLE The perimeter of figure GHJKL is (8
r + 17) cm. The perimeter of square GHJK is 8 cm.
- Find the perimeter of triangle GKL in terms of r.
- The perimeter of figure GHJKL is 73 cm. What is the value of r? Give your answer in cm.
(a)
Length of the square
= 8 ÷ 4
= 2 cm
Total lengths of GH, HJ and JK
= 3 x 2
= 6 cm
Perimeter of triangle GKL
= 8
r + 17 - 2 - 2
= (8
r + 13) cm
(b)
8
r + 17 = 73
8
r = 73 - 17
8
r = 56
r = 56 ÷ 8 = 7
Value of
r = 7 cm
Answer(s): (a) (8
r + 13) cm; (b) 7 cm