Area & Perimeter

This resource is explicitly missing three vital pieces of information which are firstly, the area and perimeter of a circle (A=pie x radius^2 and P=2 x pie x radius). Secondly, the area and perimeter of a semi-circle (A=1/2 x pie x radius^2 and P=pie x radius + 2 x radius). Thirdly, the area and perimeter of a sector (A=angle/360 x pie x radius^2 and P= 2 x radius + (angle/180 x 2 x pie x radius)). Whether this is something to do with the loading of the page or the author forgetting to include these I do not know. But the point is if other people can see this the way I have then you have a serious problem that needs solving. I signed up to receive extra revision material only to find parts missing. People expect everything and anything they need to access handy. I suggest the author sorts the problem out ASAP!