Prisms
What shape are the sides of a rectangular prism?
Rectangles
what is the formula for surface area of a cylinder?
Surface Area=2πr^2+2πrh
What is the formula for SA of a cone?
SA=πr(r+l)
what is the formula for SA of a sphere?
SA=4πr^2
surface areas is meaured in what kind of units?
square units
What is the formula for surface area of a rectangular prism?
A= 2(l x w x h)
what shape is the top of a cylinder?
a circle
what does the "l" mean in the formula?
slant height
how many flat faces does a sphere have?
surface area meaures the outside or inside?
Outside
A box is 2x3x4. What is the surface area?
52 units ^2
when you unwrap a cylinder what is the shape of the side when you unwrap it?
a rectangle
how many flat surfaces does a cone have?
1
A sphere has a r= 5 find SA in terms of π
4π(25) = 100π
what do you need first to find before plugging into formulas?
radius, height, or side lengths
How many faces does a rectangular prism have?
6
Name something in real life that is shaped like a cylinder
can
a cone have a r= 3, l=5 find SA in terms of π
SA=π(3)(8) = 24π
what does the "r" stand for?
radius
why is it helpful to know surface area in real life?
to know how much paint, wrapping paper, or material you need to cover something.
What does surface area mean?
The total area of all the faces
How many circles does a cylinder have?
2
What shape is the base of a cone?
circle
if the radius doubles what happens to the surface area?
SA of a Sphere = 4π(2)^2
SA of a Sphere = 4π(4)^2
it gets 4 times bigger
what is the difference between surface area and volume?
Surface area measures the outside, while volume measures how much space is inside.