X➝-x by reflection, so g(x)=-x
To find the circumference of a round object, you will take the diameter and multiply is by pi to get 78.5mm
If the polygons are similar, then the top side is equal to one half of the left side.
Since side (x -1) = 8, then x = 9.

by using the integration formula
we get,

now put the value of t=\sin\theta in the above equation
we get,

hence proved
1/2u - 3 x u
2u x u = 2u
answer 2u - 3