KLMN is a rectangle which has a breadth of 7 m. It is divided into 4 triangles. Triangle P is
112 of the area of the rectangle and
13 the area of Triangle R. Triangle Q has an area of 28 m
2.
- Find the area of the rectangle.
- Find the perimeter of the rectangle.
P |
Q |
R |
Rectangle |
1 |
|
|
12 |
1 |
|
3 |
|
1 u |
2 u |
3 u |
12 u |
(a)
Area of Triangle Q
= Half of Rectangle KLMN - Triangle R - Triangle P
= (12 u ÷ 2) - 1 u - 3 u
= 2 u
2 u = 28
1 u = 28 ÷ 2 = 14
Area of the rectangle
= 12 u
= 12 x 14
= 168 m
2 (b)
Length of the rectangle
= 168 ÷ 7
= 24 m
Perimeter of the rectangle
= 24 x 2 + 7 x 2
= 62 m
Answer(s): (a) 168 m
2; (b) 62 m