Hi all,
I have a serious issue with sectors/arcs/segments in C2. In class I was taught to use the formula 0.5r^2(0-sin0) to calculate the area of a segment. Incidentally, 0 represents theta.
However, this is now the second exam question I've encountered where the formula is used in the reverse order. So they use 0.5r^2(sin0-0) and I do no understand why.
For the question in the image below, I did 0.5(9)(1.0766-sin(1.0766)) = 8.806 for the area.
The mark scheme reads: 0.5(9)(sin(1.0766)-0.5(9)(1.0766) = 3.507 for the area i.e the calculation is in reverse order.
I would appreciate it if someone could enlighten me.
Thanks in advance.