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Definitions
Problem Solving
Grab-Bag
Trick Questions
Circles
100

What is the diameter?

The length of a straight line passing through the center of a circle and connecting two points on the circumference.

100

What is the radius of a circle with a diameter of 4.5m?

r=2.25m

100
What symbol represents pi? (explain in words)
π
100
How many formulas are there to find the area of a circle?
one: a=πr²
100

How many degrees do 2 circle have?

720°

200
How do you find the radius?
Divide the diameter by 2, or measure the center of the circle to the side.
200
What is the circumference of a circle with a diameter of 4cm? (use 3.14 as pi) c=πd
c=12.56cm
200
Why is a circle not a polygon?
Because it isn't made of straight lines.
200
Is the diameter equal to twice the radius?
yes
200

What shapes measure 360°?

circles and quadrilaterals.

300

What is pi and an adjective to describe it?

Pi is the ratio of the circumference to the diameter of a circle, or circumference÷diameter and it is irrational.

300

What is the area of a circle with a radius of 6? Use 3.14 as pi. a=r²π

a=113.04

300
How many degrees are in a circle?
360°
300

How many sides does a circle have?

undefined!

300

How many lines of symmetry do circles have?

An infinite amount?

400
What is circumference and how do you find it?
Circumference is the perimeter of a circle. You find the circumference by multiplying pi and the diameter.
400
What is the area of a circle with a diameter of 6? a=r²π use 3.14 as pi.
a=28.26
400
What are the first 6 digits of pi?
3.14159
400
How many digits are in pi?
infinite!
400
Is a circle an oval, or is an oval a circle?
Neither
500
Define "irrational"
A number that cannot be written as a simple fraction - the decimal goes on forever without repeating.
500
What is the circumference of a circle with a radius of 6? use 3.14 as pi
c=37.68
500
What fraction best represents pi?
22/7
500
On my way to the fair, I met 7 jugglers and a bear, every juggler had 6 cats, every cat had 5 rats, every rat had 4 houses, every house had 3 mouses, every mouse had 2 louses, every louse had a spouse. How many in all are going to the fair?
Just me. The others were coming from the fair!
500

What is another name for a circle?

A flat sphere