Question

1) Find the area of a square park whose perimeter is 320m.

2) Find the breadth of a rectangle plot of
land.If it's area is 440m2 and the length is 22m. Also find its perimeter.

3) The perimeter of a rectangle is 130m.If the breadth of the rectangle is 30cm,find it's length.Also find the area of the rectangle.​

Answer 1

Answer:

1) 6400m²

2) 84m

3) 1050 cm²

Step-by-step explanation:

1) Perimeter of a square = 4 × side

Perimeter of the square park = 320m

4 × side = 320

side = 320/4

side = 80m

Area of a square = side²

Hence, Area of the square park = 802 = 80 × 80 = 6400m²

2) Area of a rectangular plot of land = 440 m²

Length of the rectangular plot of land = 22 m

Let's say that breadth of rectangular plot of land = x

We know that,

Area of rectangle = Length × Breadth

440 = 22x

x = 440/22

x = 20 m

So, breadth of the rectangular plot of land=20 m

Perimeter of a rectangle = 2 (Length + Breadth)

= 2 (22 + 20) m

= 84 m

3) Breadth of the rectangle = 30 cm

Perimeter of a rectangle = 130 cm

Perimeter of rectangle = 2 × [Length(l) + Breadth(b)]

130 cm = 2 × (l + 30 cm)

130 cm = 2l + 60 cm

2l = 130 cm - 60 cm

2l = 70 cm

l = 70/2 cm

l = 35 cm

Area of Rectangle = Length × Breadth

= (35 × 30) cm²

= 1050 cm²