Question

from a square metal sheet of side 28cm a circular sheet is cut off. find the radius of the largest possible  circular sheet that can be cut  .also find  the area  of  the remaining sheet

Answer 1

Diameter of largest circle that can be cut is 28cm. (see picture)
So radius = 28/2 = 14cm

Area of remaining sheet = area coloured 
=area of square - area of circle
=28² - π×14²
=784 - 615.44
=168.56 cm²

Answer 2

Diameter of largest circle that can be cut is 28cm.so radius=28/2=14cm.

Area of remaining sheet=area coloured

area of square=area of circle

28square -- π*14square

784 -- 615.44

168.56cm