PSLE A plot of land which had an area of 1400 m
2 was divided into three portions of equal width. These portions were fenced using 223 m of fence as shown.
- Find the length of JK.
- Find the perimeter of the plot of land.
(a)
Length of the width of each portion
= 42 ÷ 3
= 14 m
Length of JK
= (223 - 42 - 42 - 36 - 36) ÷ 2
= 67 ÷ 2
= 33.5 m
(b)
Area of the biggest rectangle
= 36 x 14
= 504 m
2
Area of the medium rectangle
= 33.5 x 14
= 469 m
2 Area of the smallest rectangle
= 1400 - 504 - 469
= 427 m
2 Length of the smallest rectangle
= 427 ÷ 14
= 30.5 m
Perimeter of the plot of land
= 223 - (2 x 30.5)
= 223 - 61
= 162 m
Answer(s): (a) 33.5 m
2; (b) 162 m