PSLE The perimeter of figure GHJKL is (10
b + 11) cm. The perimeter of square GHJK is 12 cm.
- Find the perimeter of triangle GKL in terms of b.
- The perimeter of figure GHJKL is 91 cm. What is the value of b? Give your answer in cm.
(a)
Length of the square
= 12 ÷ 4
= 3 cm
Total lengths of GH, HJ and JK
= 3 x 3
= 9 cm
Perimeter of triangle GKL
= 10
b + 11 - 3 - 3
= (10
b + 5) cm
(b)
10
b + 11 = 91
10
b = 91 - 11
10
b = 80
b = 80 ÷ 10 = 8
Value of
b = 8 cm
Answer(s): (a) (10
b + 5) cm; (b) 8 cm