Sin x = sin 2x
x=2kπ+2x
x=-2kπ
also
x=2kπ+π-2x
3x=2kπ+π
x=2kπ/3+π/3
:') alright. Break down the composite shape into 2 separate shapes:
The radius of the semi-circle is 14/2=7cm
So the area of the semi-circle is (pi×7^2)/2=77cm^2 to 1 d.p.
The area of the rectangle is 14×20=280cm^2
280+77=357cm^2 is the area of the composite shape