What is the formula for the area of a circle?
Area & Circumference of Circles

Flashcard
•
Mathematics
•
7th Grade
•
Hard
Quizizz Content
FREE Resource
Student preview

15 questions
Show all answers
1.
FLASHCARD QUESTION
Front
Back
A = πr², where A is the area and r is the radius.
2.
FLASHCARD QUESTION
Front
What is the formula for the circumference of a circle?
Back
C = 2πr or C = πd, where C is the circumference, r is the radius, and d is the diameter.
3.
FLASHCARD QUESTION
Front
If the radius of a circle is doubled, how does the area change?
Back
The area increases by a factor of four.
4.
FLASHCARD QUESTION
Front
What is the relationship between diameter and radius?
Back
The diameter is twice the radius (d = 2r).
5.
FLASHCARD QUESTION
Front
How do you convert diameter to radius?
Back
Divide the diameter by 2 (r = d/2).
6.
FLASHCARD QUESTION
Front
What is the circumference of a circle with a radius of 10 inches?
Back
C = 2π(10) = 20π ≈ 62.83 inches.
7.
FLASHCARD QUESTION
Front
What is the area of a circle with a radius of 5 feet?
Back
A = π(5)² = 25π ≈ 78.54 ft².
Create a free account and access millions of resources
Similar Resources on Quizizz
10 questions
Circles

Flashcard
•
7th Grade
11 questions
Parts of a Circle (1)

Flashcard
•
7th Grade
12 questions
Area and Circumference of Circles Review

Flashcard
•
7th Grade
10 questions
Circles

Flashcard
•
7th Grade
11 questions
Area and Circumference of a Circle

Flashcard
•
7th Grade
11 questions
Area and Circumference of a Circle

Flashcard
•
7th Grade
11 questions
Area and Circumference of a Circle

Flashcard
•
7th Grade
10 questions
Circumference and Area of Circles

Flashcard
•
7th Grade
Popular Resources on Quizizz
15 questions
Multiplication Facts

Quiz
•
4th Grade
25 questions
SS Combined Advisory Quiz

Quiz
•
6th - 8th Grade
40 questions
Week 4 Student In Class Practice Set

Quiz
•
9th - 12th Grade
40 questions
SOL: ILE DNA Tech, Gen, Evol 2025

Quiz
•
9th - 12th Grade
20 questions
NC Universities (R2H)

Quiz
•
9th - 12th Grade
15 questions
June Review Quiz

Quiz
•
Professional Development
20 questions
Congruent and Similar Triangles

Quiz
•
8th Grade
25 questions
Triangle Inequalities

Quiz
•
10th - 12th Grade