Circles
You want to paint a circular wall with a diameter of 8 inches. What formula would you use?
A = pi x r x r
What is the universal way to write an equation
y = kx
Judy wants to make a poster of her square photo. The scale from the poster to the photo is 3 ft to 1 in. The photo is 4 inches long. What is the side length of the poster
12 ft
On a graph, the COP can always be found at X = ___
(1, k)
(1, cop)
This cuts your circle in half
diameter
You have a circle with a radius of 12 inches. Find the Circumference use pi in your answer.
C= 24 pi
jeff works at a store. he makes $9 every 1/2 and hour. Write an equation that represents the relationship between M money and h hours.
m = 18 h
Brandon makes a scale drawing of a deck. The scale for the actual deck to the scale drawing is 5ft to 1 in. The dimensions for the deck are 15.5 ft by 40 ft. What are the dimensions for the deck scale drawing.
3.1 in by 8in
In a recipe for every 1/4 cups of sugar. 3/5 cup of flour is needed. How many cups of sugar are needed for 1 cup of flour.
5/12
This is half your diameter
radius
A tire has a diameter of 8 inches. You want to find out the distance after 7 full rotations. Use 3.14 for pi.
175.84 inches
Jada use the equation c = 9.86 t. where c is the total cost in dollars and t is the number of tickets bought. What is the constant of proportionality
9.86
What do you know about a scale drawing
it has same shape but difference sizes
proportion stays the same ( doesnt look distorted)
there is a scale
What is the unit rate (COP) of
ratio 2/7 to 3/21
2/7 x 21/3
42/21
6/3
2
This formula is used when you want to find the distance around a circle
C = D x Pi
Mark's Circular tray has a diameter of 14 inches. Find the area. use 3.14 for pi.
153.86 inches ^2
Jada use the equation c = 9.86 t. where c is the total cost in dollars and t is the number of tickets bought. What is the cost of each ticket?
$9.86
FREEBIE
(2x points)
When is your test
MOnday
What is the unit rate (COP) of following ratios
5/11 / 2/7
5/11 x 7/2
35/22
This formula is used when you want to cover or fill in the inside of a circle
A= Pi x r x r
The circumference
C= 74 pi
What is the radius
37
Th cost of 4 gallons of gas is $20. Write an equation to show the relationship between the cost, C, and the gallons of gas, g.
C= 5g
HOw can you study for this exam?
at least 2 ways
looking at resource pdf link with youtube videos
reviewing going over Form A + B
A proportional graph has a point at (5, 40). What is an equation we can write?
40/5= 8
y = 8x
This is how you find COP with a given point
cop = y/x