New Vocab
The set of all points on a plane that are a fixed distance from a center
Circle
What's longer, a circle's radius or its diameter?
Diameter
I'm a circle and my radius is 16.1 cm. What is my diameter?
Diameter = 32.2 cm.
3x = 5
x = log(5) / log(3)
Distance from the center of a circle outwards
Radius
How do you find the area of a circle?
A = Pi * radius2
I'm a circle and my radius is 16.1 cm. What is my circumference? (round to the nearest hundredth)
Circumference = 101.11 cm
What is the shape of a quadratic function?
parabola
Distance straight across a circle, through the center
Diameter
What is the term for 'half a circle'?
Semicircle
I'm a circle and my radius is 16.1 cm. What is my area? Round to the nearest hundredth.
Area = 813.92 cm2
The distance around a circle
Circumference
If you take a 1/4 slice of a circle, you have a _________.
Quadrant
I'm a circle and my area is 500cm2. What is my circumference? (round to the nearest tenth)
Circumference = 79.2 cm
A part of the circumference of a circle
Arc
Explain how we got the value 'Pi' from the circle.
Pi = Circumference / Diameter
A circle is actually a special case of an __________ (hint: stretched circle)
ellipse