A circular metal disc of radius 10.5 cm has a small circular hole of radius 3.5 cm drilled at its centre.
Find the area of the metal that remains. (Take π = $\frac{22}{7}$ )

Question

A circular metal disc of radius 10.5 cm has a small circular hole of radius 3.5 cm drilled at its centre. Find the area of the metal that remains. (Take π = 22/7)

Accepted Answer

308. Outer = 22/7*10.5*10.5 = 346.5 cm^2. Hole = 22/7*3.5*3.5 = 38.5 cm^2. Remaining = 346.5 - 38.5 = 308 cm^2.

A circular metal disc of radius 10.5 cm has a small circular hole of radius 3.5 cm drilled at its centre.
Find the area of the metal that remains. (Take π = $\frac{22}{7}$ )

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 7 Area of a Circle practice

A circular metal disc of radius 10.5 cm has a small circular hole of radius 3.5 cm drilled at its centre.Find the area of the metal that remains. (Take π = 722​)

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 7 Area of a Circle practice

A circular metal disc of radius 10.5 cm has a small circular hole of radius 3.5 cm drilled at its centre.
Find the area of the metal that remains. (Take π = $\frac{22}{7}$ )