Equations
What does π (pi) represent?
3.14 or 3.14159
Find the area of a circle with a radius of 3 cm
28.26 cm2
What is the definition of circumference?
The distance around a circle, the outside of a circle
π is the area of a circle of radius 1
true
What is the formula for area of a square or rectangle?
A=bh or A=lw
Find the area of a circle with a radius of 50 cm
7850 cm2
What is the circumference of a circle with a radius of 6 cm
37.68 cm
π is the area of a circle of diameter 1.
false
What is the equation for circumference?
C=2πr or c=πd
Find the area of a circle with a diameter of 15 in
176.625 in2
What is the circumference of a circle with a radius of 16 in?
16π or 50.24
π is the circumference of a circle of radius 1.
false
What is the formula for area of a circle?
A=πr2
What is the area of this shape? (teacher will display shape)
94.625 or 95 units2
If circumference of a circle is 132 cm, what is the radius of that circle?
21.019 cm
π is the circumference of a circle of diameter 1.
true
How many radii make up one diameter?
2
What is the area of a circular field with a 370 foot diameter?
107,466.5 ft2
What is the diameter of a circle with a circumference of 750 ft?
238.85 ft
Must answer both correctly for full points
1. π is the constant of proportionality relating the diameter of a circle to its circumference.
2. π is the constant of proportionality relating the radius of a circle to its area.
1. true
2. false