Circles
What is the formula to find the circumference of a circle?
1) C= 2(pi)r
2) C= (pi)(d)
What is circumference?
The distance around the outside of a circle.
Convert 0.25 to a percent
25%
What is 37% of 500?
185
Omar made $500 per day. He stopped showing up and got demoted to a job that paid $250. What was the percent change?
50% decrease.
If a circle has a diameter of 8cm, what is the radius?
r=4cm
What is a percent?
A ratio compared to 100.
Convert 0.8 to a percent
What is 86% of 1,000?
860
Sam went from making $400 to $620. What was the percent change? Was it an increase or decrease?
Increase of 55%
Given a circle with a diameter of 10 ft. Calculate the circumference. Use 3.14 for the value of pi.
C=10pi
C=10(3.14)
C=31.4 ft
What is a radius?
A line segment with one end on the center of a circle and the other end somewhere on the circle.
Convert 1.34 to a percent
134%
What is 9% of 245?
22.05
Liam made $40 an hour. He received a 20% increase in pay. What does Liam make per hour now?
40 x 0.20 = 8
40+8=48
Liam makes 48 dollars an hour.
Given a circle with a radius of 3m, what is the circumference? Use 3.14 for the value of pi.
C=2(pi)r
C=2(pi)(3)
C=6pi
C=6(3.14)
C=18.84 m
What is a diameter?
A line segment that passes through the center and both ends lie somewhere on the circle.
Convert 2.568 to a percent
256.8%
What is 2% of 2,500?
50
Samantha found a dress that cost 80 dollars. She had a coupon and only payed 20 dollars.
75% off
20-80/80=0.75
The minute hand of a clock measures 12 inches. If one hour has passed what is the distance the minute hand of the clock traveled in total? Use 3.14 for the value of pi.
r=12in
C=2(pi)r
C=2(pi)(12)
C=24pi
C=24(3.14)
C=75.36 inches
How do we find percent change? (What is the formula)
(New Amount - Original Amount) / Original Amount
Convert 0.168436 to a percent.
16.8436%
What is 225% of 8?
18
What is Mr. Guzman's middle name
William