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- It has 2 circular faces (top & bottom)

- It has one curved side

- It is not a polyhedron as it has a curved surface

Surface Area = 2πr(r+h)

Which is made up of:

Surface area of circular base = πr² Surface area of curved surface = 2πr

x h

Surface Area = 2πr(r+h) = 2π(2)

(2+7) = 2π(2)(9) = 36π ≈ 113.097

If the height(h) is 2, and the radius(r) is 7, find the surface area of the cylinder.

Volume = πr²hJust multiply the area of the base by the height of the

cylinder:

- Area of the base: πr²

- Height: h

- Volume = Area × Height = πr² x h

How to remember: Volume = pizza

Imagine that you just made a pizza,

z = radius, a = height, find the volume of the pizza.

Volume = πr² x hVolume = 22/7(2²)(6)= 75.429cm³

Given that the radius is 2 and a height is 6, find the volume.

Volume= πr² x hVolume =22/7(3²)(5)=141.428cm³

What is the volume of the cylinder with a radius of 3 and a height of 5?

What is a circle?•A circle is a type of line. •The distance between any points and the centre is called the radius. •Diameter of a circle is any straight line that passes through the center of the circle and whose endpoints lie on the circle.

π = 22/7 or 3.142 r = is the radius of the circle

1. Calculate the area of the circle when the radius of the circle is 7cm

2. Calculate the radius when the area of the circle is 113.10cm

1. π x 7² = 153.94cm²2. πr² = 113.10cm² r² = 113.10/π r² = 36 r = √36 r = 6cm

Find the area of sector AOB.

Solution:

Area AOB= ½ x 450² x 2π/3 rad. = 212057.5 m²

Find the area of sector AOB

Solution:

AOB in radian=(∏/180) x 120= 2.094 rad.

Area AOB = ½ x 4² x 2.094 = 16.755cm²