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Question
primary 6 | Maths
| Measurement
One Answer Below
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Pls help
Date Posted: 4 years ago
Views: 199
Area of shaded part
= Area of 2 semicircles of diameter 20 cm - Area of 2 semicircles of diameter 4 cm
= Area of 1 full circle of diameter 20 cm - area of 1 full circle of diameter 4 cm
= pi x 10^2 - pi x 2^2
= 100pi - 4pi
= 96pi
= 301.592894 cm2
~ 301.59 cm2
= Area of 2 semicircles of diameter 20 cm - Area of 2 semicircles of diameter 4 cm
= Area of 1 full circle of diameter 20 cm - area of 1 full circle of diameter 4 cm
= pi x 10^2 - pi x 2^2
= 100pi - 4pi
= 96pi
= 301.592894 cm2
~ 301.59 cm2
Perimeter of shaded part
= 2 x Curved part of semicircle of diameter 20 cm + 2 x Curved part of semicircle of diameter 4 cm
= 1 x full circumference of circle of diameter 20 cm + 1 x full circumference of circle of diameter 4 cm
= pi x 20 + pi x 4
= 20pi + 4pi
= 24pi
= 75.3982236 cm
~ 75.40 cm
= 2 x Curved part of semicircle of diameter 20 cm + 2 x Curved part of semicircle of diameter 4 cm
= 1 x full circumference of circle of diameter 20 cm + 1 x full circumference of circle of diameter 4 cm
= pi x 20 + pi x 4
= 20pi + 4pi
= 24pi
= 75.3982236 cm
~ 75.40 cm
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Hope this helps
Date Posted:
4 years ago
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