Name: __________________________________________ Date: ___________________________ Period: ___________
We will learn to: Use formulas to find ___________________________________________________________________
Circle:
Use proportions to find _________________________________________________________________
Circumference:

Area:

Formula:
Formula:
NOTE:
Arc: __________________________________________
Sector: ________________________________________
_______________ = _________
_______________ = _________
Arc Length =
Sector Area =
Example 1: Round to nearest hundredth if necessary.
a. Find the circumference of a circle with radius of 9 cm.
b. Find the radius of a circle with a circumference of 26 m
Example 2: Round to nearest hundredth if necessary.
a. Find the area of the figure below if its radius is 2.5 cm.
b. Find the diameter of the CD if its area is 113.1 cm2.
Example 3: Round to nearest hundredth if necessary.
a. Find the arc length of AB.
b. Find the circumference.
Example 4: Round to nearest hundredth if necessary.
a. Find the area of the small sector.
Practice:
c. Find the mRTS.
b. Find the area of circle.
1. Find the distance around a 5-inch diameter circle.
2. Find the diameter of a circle with a circumference of
17 feet.
3. Find the arc length of PQ.
4. Find the circumference.
Use for #5-7.
5. Find the area of circle.
8. Find the area of the circle
6. Find area of the small sector.
7. Find area of the large sector.