What is the formula for the area of a circle?
Circle Geometry Concepts and Formulas
Interactive Video
•
Mathematics
•
6th - 7th Grade
•
Hard
Mia Campbell
FREE Resource
This video tutorial teaches how to find the area of a circle using its circumference. It begins with a review of the formulas for area and circumference, highlighting a common mistake where students use the diameter instead of the radius in calculations. The tutorial then provides examples, including one with an exact pi value and another with an approximated pi value, to demonstrate the correct method of finding the area. By the end, viewers will understand how to correctly calculate the area of a circle using its circumference.
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
pi times diameter squared
pi times radius squared
pi times diameter
2 times pi times radius
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for the circumference of a circle?
pi times diameter squared
pi times radius
2 times pi times radius
pi times radius squared
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a common mistake when calculating the area of a circle?
Using diameter instead of radius
Using radius instead of diameter
Using pi as 3
Using circumference as area
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If a circle has a diameter of 6 cm, what is the correct area?
36 pi cm squared
9 pi cm squared
18 pi cm squared
12 pi cm squared
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the diameter of a circle if its circumference is 18 pi yards?
36 yards
18 yards
9 yards
27 yards
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the area of a circle with a radius of 9 yards?
18 pi yards squared
81 pi yards squared
36 pi yards squared
9 pi yards squared
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If the circumference of a circle is approximately 37.68 cm, what is the diameter using pi as 3.14?
12 cm
9 cm
18 cm
6 cm
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