Angles and Shapes
A pair of angles that add up to 90 degrees
Complementary angles
A line from the center of a circle to the outside
radius
Solve for x:
3x+12=-120
x = -44
-13 x -8
104
If Jared can run 1/3 of a mile in 4 minutes, what is his rate in miles per hour?
5 miles per hour
A pair of angles that add up to 180 degrees
Supplementary angles
The distance around a circle
Circumference
Solve the inequality:
-3x > 21
x < -7
1/2 divided by 3
1/6
Levi read 4 1/2 books in 2 1/4 months. What is Levi's reading rate in books per month?
2
Formula for area of a triangle
1/2 base times height
Pi times radius squared
When do you flip an inequality sign?
When you multiply or divide by a negative number.
-16/4
-4
Alan is saving to buy a computer that costs $2,106. He has saved 30% of the total cost. About how much more money does Alan need in order to buy the computer?
About $1,500
What is the area of a parallelogram that has a base of 15 and a height of 8?
120
Line across the center of the circle, with both endpoints on the circle
Diameter
Solve for y:
y + 18 + -24 = 100
y = 106
23% of 400
92
Tom swims at a rate of 50 meters in 40 seconds. At this rate, how many meters will he swim in 1 minute?
75 meters
How many degrees in a triangle?
180
How do you find the circumference of a circle
Pi times diameter
155 = 2x - (-15)
x = 70
What is the percent decrease from 50 to 40?
20%
If a spinner lands on red 3/5 times. What is the experimental probability it will land on red, if it is spun 20 times?
12