O-level Mathematics june 05 paper 1 questn 18

[dasani]

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]

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.

You'd surely have done part (a) and found the area of sector OAB in terms of x. Now put

area of semicircle = 3 x Area of sector OAB

. The area of semicircle is 8 pie.

 

[dasani]

thanks