1/4 x ∏ x 8 x 8 = 16 pi
1/4 x ∏ x 4 x 4 = 4 pi
16 pi - 4 pi = 12 pi B + X
8 x 4 = 32 B + Y
12 pi - 32 = 5.7 cm2
It was 5.7 cm2.
Please calculate ?? as I do not have a proper calculator.
Thursday, September 9, 2010
Circle P6 2010 SA2 HHK P2 Q13
The figure below shows 2 quarter circles and a rectangle. The radius of the big quarter circle is 8 cm. The radius of the small quarter circle is 4 cm. Find the difference in area between the two shaded parts X and Y. Use the calculator value of pi and give your answer correct to 1 decimal place.
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Thought it should be
ReplyDelete(64 x pi - 16 x pi)/ 4 - 32 or will not get answer 5.7
Yes it is 48 pi - 32.
ReplyDeleteThe answer was copied without checking??
It should be 118.8 or 118.9.
answer 5.7 is correct
ReplyDelete