Question

please give correct ans of the question no 18.

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Answer 1

Answer:

⇒ Radius of semi-circle (r)=

4

14−6

=

4

8

=2cm

⇒ Side of a small square 2r=2×2=4cm

⇒ Area of big square =(side)

2

=(14)

2

=196cm

2

⇒ Area of a small square =(side)

2

=(4)

2

=16cm

2

⇒ Area of 4 semicircle =4×

2

πr

2

=4×

2

3.14×(2)

2

=25.12cm

2

∴ Area of shaded region = Area of a big square - Area of a small square - Area of a 4 semicircle.

∴ Area of shaded region=(196−16−25.12)cm

2

=154.88cm

2

Answer 2

Answer:

⇒ Radius of semi-circle (r)= 14−6 / 4

= 8/4

=2cm

⇒ Side of a small square 2r=2×2=4cm

⇒ Area of big square =(side)^2 =(14)^2

=196cm^2

⇒ Area of a small square =(side)^2

=(4)^2

=16cm^2

⇒ Area of 4 semicircle =4× πr ^2/2

=4× 3.14 × (2)^2 / 2

= 25.12cm^2

∴ Area of shaded region = Area of a big square - Area of a small square - Area of a 4 semicircle.

∴ Area of shaded region=(196−16−25.12)cm^2

=154.88cm^2