Question

c)
Find the
a the perimeter of a rectangle whose
area = 1050 sq cm, length = 35 cm
area = 4800 m-, breadth = 60 m​

Answer 1

Answer:

a. 130 cm

b. 280 m

Step-by-step explanation:

A.

Divide:

1050 / 35 = 30(this is the width)

Find the perimeter:

30 + 30 + 35 + 35 = 130

B.

DIvide:

4800 / 60 = 80(this is the length)

Find the perimeter:

80 + 80 + 60 + 60 = 280

Answer 2

Question:

Find the perimeters of the given rectangles whose ;

1) Area = 1050 sq. cm

Length = 35 cm

2) Area = 4800 sq. m

Breadth = 60 m

Answer:

1) 130 cm

2) 280 m

Note:

• Perimeter of a rectangle is given by ;

P = 2•(Length + Breadth)

• Area of a rectangle is given by ;

A = Length•Breadth

Solution:

1) Given:

Area = 1050 sq. cm

Length = 35 cm

We know that;

=> Area = Length•Breadth

=> 1050 = 35•Breadth

=> Breadth = 1050/35

=> Breadth = 30 cm

Now,

=> Perimeter = 2•(Length+Breadth)

=> Perimeter = 2•(35+30)

=> Perimeter = 2•65

=> Perimeter = 130 cm

2) Given:

Area = 4800 sq. m

Breadth = 60 m

We know that;

=> Area = Length•Breadth

=> 4800 = Length•60

=> Length = 4800/60

=> Length = 80 m

Now,

=> Perimeter = 2•(Length+Breadth)

=> Perimeter = 2•(80+60)

=> Perimeter = 2•140

=> Perimeter = 280 m