PSLE The perimeter of figure ABCDE is (6
e + 22) cm. The perimeter of square ABCD is 8 cm.
- Find the perimeter of triangle ADE in terms of e.
- The perimeter of figure ABCDE is 40 cm. What is the value of e? Give your answer in cm.
(a)
Length of the square
= 8 ÷ 4
= 2 cm
Total lengths of AB, BC and CD
= 3 x 2
= 6 cm
Perimeter of triangle ADE
= 6
e + 22 - 2 - 2
= (6
e + 18) cm
(b)
6
e + 22 = 40
6
e = 40 - 22
6
e = 18
e = 18 ÷ 6 = 3
Value of
e = 3 cm
Answer(s): (a) (6
e + 18) cm; (b) 3 cm