Circle information
What is the equation for the area of a circle?
A = pi(r2)
What does circumference mean?
the distance around a circle (like perimeter of square)
If you have a circular mirror with a radius of 20cm, what is its area?
A = 1256 cm2
Calculate the amount of tax you would pay if you bought $128.00 in groceries with a 7% tax rate.
$8.96
Convert 14/32 to a percent. Round to the nearest hundrenth.
43.75%
What do we call the circumference divided by the diameter?
Pi (3.14)
What is the equation for circumference?
c=pi(d) or
c= pi(2r)
what is the area of a circle with a 2.4 cm radius? (to the nearest tenth)
A=18.1cm2
$137.39
Austin makes a commission of 6% on a $18,600 car he sold last week in addition to his base salary of $300. How much money did he make in total?
$1,416
What are the equations for finding the radius and diameter?
radius= d ÷ 2 diameter =r x 2
What is the circumference of a circle if it has a diameter of 5.2 m?
answer: 16.33m
c=3.14 x 5.2
A circle has a diameter of 25cm. What is it's area?(2 decimal places)
r=12.5cm
A= 490.63cm2
A TV costs $1,245 at Best Buy. If Harrison has a 15% off coupon, to the nearest cent, what will he pay for the TV?
$1,058.25
A savings account increased from $350 to $430. To the nearest percent, what is the percent increase?
26%
What is the radius of a circle with a diameter of 95m?
47.50 m
If you are given a radius of 6cm, what is the circumference?
37.68 cm
Calculate the area of a semi-circle with a diameter of 8.4 feet. Round to the nearest tenth.
A= 27.7 feet2
The value of an investment increased from $750 to $795. By which percentage did the value of the investment increase?
6% increase
To the nearest cent, what is the total cost of a pair of shoes that cost $85, is 15% off and has a 6% sales tax? (hint: discount before tax)
$76.59
A spinner travels around in a circle. The radius of the spinner is 3 inches. Mike spins the spinner and it travels completely around the circle 5 times. About how far did the tip of the spinner travel?
~94.2 inches
What is the diameter of a circle that has a circumference of 221mm? (round to nearest hundredth)
c= π x d 221mm = 3.14 x d 221/3.14 =d d=70.38mm
Fourty-four meters of fencing is used to make a circular enclosure. What is the area of the circle? (to the nearest square meter)
44 is the circumference
A=154 m2
Sally buys a shirt on sale. The sale price of the shirt is 25% off the marked price. After the sale price is calculated at the register, the customer uses a 10% off coupon. The marked price of the shirt is $15.60. What does the customer pay for the shirt?
Keith's parents deposited $3,200 into his savings account as a college fund when he was born. How much will Keith have in total after 18 years at a simple interest rate of 3.25%?
I=PRT
I = 3,200 x 0.0325 x 18
I= $1,872
TOTAL = $1,872 + $3,200
FINAL ANSWER= $5,072