Ok I have this Maths courseowrk that has to be in tomorow and i've only done the simplest parts and now i need help coz my teacher will kill me if i dont kill myself first!

Anyway, so, i need to know the formula for the area/volume of these shapes in x/y form:

Paralellogram

Cylinder

Regular pentagon

Right angled triangle (shortest lengths x and y)

Isosceles triangle

Square based pyramid

Cone

And then i need help with how to work out the equation e.g:

Cirlce - Area = Pi*r²

Circumference = 2*Pi*r

2*Pi*r = Pi*r² (/r)(/Pi)

r = 2

Rectangle - Perimeter = 2x + 2y

Area = xy

xy = 2x + 2y (-2x)

xy - 2x = 2y

x (y - 2) = 2y (/ (y - 2))

x = 2y / y - 2

If anyone can help it would be amazing!!!

Thanks x