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O-level Mathematics june 05 paper 1 questn 18

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dasani

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18(b) PQR is a semicircle of radius 4 cm.
The area of the sector OAB is of the area of
this semicircle.
Calculate the value of x.



help.
 
Zishi

Zishi

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dasani said:
18(b) PQR is a semicircle of radius 4 cm.
The area of the sector OAB is of the area of
this semicircle.
Calculate the value of x.



help.
Click to expand...

You'd surely have done part (a) and found the area of sector OAB in terms of x. Now put
Code: 
area of semicircle = 3 x Area of sector OAB
. The area of semicircle is 8 pie. ;)
 
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