PSLE The perimeter of figure EFGHJ is (7
m + 13) cm. The perimeter of square EFGH is 8 cm.
- Find the perimeter of triangle EHJ in terms of m.
- The perimeter of figure EFGHJ is 69 cm. What is the value of m? Give your answer in cm.
(a)
Length of the square
= 8 ÷ 4
= 2 cm
Total lengths of EF, FG and GH
= 3 x 2
= 6 cm
Perimeter of triangle EHJ
= 7
m + 13 - 2 - 2
= (7
m + 9) cm
(b)
7
m + 13 = 69
7
m = 69 - 13
7
m = 56
m = 56 ÷ 7 = 8
Value of
m = 8 cm
Answer(s): (a) (7
m + 9) cm; (b) 8 cm