Question

745
per metre.
.
4. The area of a rectangular sheet of aluminium is 400 cm². If the breadth of the sheet is
16 cm, find its length. Also find the perimeter of the aluminium sheet.​

Answer 1

Answer:

Area of rectangular sheet = 400cm²

Breadth= 16 cm

Length = Area / Breadth

Length= 400 / 16

Length = 25 cm

Answer 2

Answer:

I think the answer is -

Step-by-step explanation:

Given,

Diameter of circular table top = 1.6 m

∴ Radius of circular table top = diameter/2

=

1.6

m

2

= 0.8 m

Rate of polishing = ₹ 15 per square meter.

∴ Cost of polishing of circular table top =?

We know that,

Area of circle = π r2

∴ Area of given circular table top = 3.14 × (0.8 m)2

= 3.14 × 0.64 m2

= 2.0096 m2

Thus, area of circular table top = 2.0096 m2

Calculation of cost of polishing

Now,

∵ Cost of polishing of 1 m2 = ₹ 15.00

∴ Cost of polishing of 2.0096 m2

= ₹ 15.00 × 2.0096

= ₹ 30.14

Thus, Cost of polishing of given circular table top = ₹ 30.14 Answer