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secondary 3 | A Maths
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Date Posted: 5 years ago
Views: 429
Area of big circle + area of 2 semicircles - area of big triangle
Area of shaded parts = Area of Big Circle + Area of both semicircles - Area of Triangle
Diameter of Big Circle = 9cm
Diameter of Semicircles = 5cm
We can combine both semicircle into a circle with diameter 5cm.
Using the formula pi * radius * radius and 1/2 * base * height l:
81/4 cm2 * pi + 25/4 cm2 * pi - 1/2 * 10cm * 9cm
= 26.5 cm2 * pi - 45cm2
= 38.21cm2
Diameter of Big Circle = 9cm
Diameter of Semicircles = 5cm
We can combine both semicircle into a circle with diameter 5cm.
Using the formula pi * radius * radius and 1/2 * base * height l:
81/4 cm2 * pi + 25/4 cm2 * pi - 1/2 * 10cm * 9cm
= 26.5 cm2 * pi - 45cm2
= 38.21cm2
See 1 Answer
done
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Seems more like a primary school question... anyways.. take a screenshot and zoom in, if the writing is too small.
Date Posted:
5 years ago
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