3­30­11.notebook
March 30, 2011
3-30-11
Aim: SWBAT find the circumference and area of a
circle given its radius or diameter.
Do Now: Copy the definitions on the next page.
Homework: Worksheet "Finding Circumference and Area"
Test Friday
Sep 4­6:19 PM
Do Now:
Define each of the following terms:
1) Radius:
The distance from the center of the circle to
any point on the circle.
2) Diameter:
A line segment that goes through the center of
the circle and has both endpoints on the circle.
3) Circumference of a Circle:
The distance around a circle.
Jan 14­3:43 PM
1
3­30­11.notebook
March 30, 2011
Notes.
Feb 9­5:22 AM
Circle Formulas
C = πd
C = 2πr
A = πr2
Mar 6­11:03 PM
2
3­30­11.notebook
March 30, 2011
For each of the following...
• Write the formula
• Substitute in the values that you know
• Leave your answer in terms of π
• Use your scientific calculators to compute the decimal
• Then round the answer to the nearest hundredth
1) Find the circumference of a circle with a radius
of 4 cm.
2) Find the circumference of a circle with a diameter
of 17 ft.
3) Find the area of a circle with a radius of 7.5 mm.
4) Find the area of a circle with a diameter of 22 yd.
Sep 4­6:28 PM
3
Attachments
Intro To Statistics.ppt
Statistics ­ PowerPoint.ppt