surface area

Today’s Today’s Objective:Objective:SWBAT find SWBAT find the surface the surface area of a area of a cylinder.cylinder.

CYLINDERS are made up of:CYLINDERS are made up of:

Two CirclesTwo Circles One One RectangleRectangle

To find the Surface Area To find the Surface Area of a Cylinder, find the of a Cylinder, find the area of the three shapes area of the three shapes that form a cylinder. that form a cylinder.

BASE BASE

LATERAL AREA

A=πrA=πr22 A=πrA=πr22

A=lA=lwwA=2πrA=2πrww

How do we find the length How do we find the length of the rectangle?of the rectangle?

In a cylinder the length of the In a cylinder the length of the rectangle has to perfectly meet rectangle has to perfectly meet the top and bottom circles. We the top and bottom circles. We

can find the length of the can find the length of the rectangle by finding the rectangle by finding the

circumference of the circle.circumference of the circle.

Put your area Put your area formulas formulas together…together…..

CYLINDERCYLINDERSA=2SA=2rh+2rh+2rr22

Efficient CanEfficient Can Is one that uses a Is one that uses a small amount of small amount of metal compared to metal compared to the amount of food the amount of food it holds.it holds.

EFFICIENCY=EFFICIENCY=

Surface AreaSurface Area

VolumeVolume