PSLE A plot of land which had an area of 1680 m
2 was divided into three portions of equal width. These portions were fenced using 247 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
= 45 ÷ 3
= 15 m
Length of JK
= (247 - 45 - 45 - 40 - 40) ÷ 2
= 77 ÷ 2
= 38.5 m
(b)
Area of the biggest rectangle
= 40 x 15
= 600 m
2
Area of the medium rectangle
= 38.5 x 15
= 577.5 m
2 Area of the smallest rectangle
= 1680 - 600 - 577.5
= 502.5 m
2 Length of the smallest rectangle
= 502.5 ÷ 15
= 33.5 m
Perimeter of the plot of land
= 247 - (2 x 33.5)
= 247 - 67
= 180 m
Answer(s): (a) 38.5 m
2; (b) 180 m