Potatoo's answer to Chris's Primary 6 Maths Geometry Singapore question.
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Let the radius of the smaller circle be r
Area of 2 small circle = 2πr^2
Area of larger circle = π(2r)^2 = 4πr^2
Area of shaded = 4πr^2 - 2πr^2
Ratio of shaded to unshaded
= (4πr^2 - 2πr^2)/(2πr^2)
You will factorize 2πr^2 out and you will get
2πr^2(2-1)/(2πr^2) and you will get 1/1 which is 1:1.
Area of 2 small circle = 2πr^2
Area of larger circle = π(2r)^2 = 4πr^2
Area of shaded = 4πr^2 - 2πr^2
Ratio of shaded to unshaded
= (4πr^2 - 2πr^2)/(2πr^2)
You will factorize 2πr^2 out and you will get
2πr^2(2-1)/(2πr^2) and you will get 1/1 which is 1:1.
Date Posted:
3 years ago
Thank you so much
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