Circumference
What is the formula for finding the circumference of a circle?
C= PI x D
or
C = PI x 2r
Is area of a circle 2-dimensional or 3-dimensional?
2-dimensional
What is radius?
Radius is a line segment from the middle of a circle to any point on the circumference.
True or False. The circle is the only one sided shape with an area.
True.
true/false
If you know the circumference of a circle, you can figure out the radius every time.
True
What is the formula for calculating the area of a circle?
A = PI r2
What is diameter?
Diameter is a line segment that intersects the middle of a circle. It can also be called the width.
True or False. A straight line is a circle with an infinite area.
True.
Calculate the circumference of a circle with a diameter of 15cm.
47.1cm
Calculate the area of a circle with a radius of 8m.
200.96m2
True or False. The diameter of a circle is a chord.
True.
What is the third digit to the right of the decimal in PI?
1
(3.141)
What is the circumference of a circle that has a radius of 14.9m?
93.572m
What is the area of a circle that has a diameter of 19km?
283.385km2
What is an arc?
The part of a circle in between two points on the perimeter of a circle.
True or False. The word "encylopedia" means "circle of learning".
True.
The circumference of a circle is 710m. What is the radius? (round to 2 decimal places at the end)
113.06m
The area of a circle is 275cm2. What is its diameter? (round to 2 decimal places at the end)
9.36cm2
What is a chord?
A line segment connecting two points on a circle.
False.
It actually has the shortest!