What is the formula for the circumference of a circle?
Flashcardizz 3.1

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Mathematics
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The circumference (C) of a circle is given by the formula: C = 2\pi r, where r is the radius.
2.
FLASHCARD QUESTION
Front
What is the formula for the area of a circle?
Back
The area (A) of a circle is given by the formula: A = \pi r^2, where r is the radius.
3.
FLASHCARD QUESTION
Front
How do you calculate the circumference of a circle using its diameter?
Back
The circumference (C) can also be calculated using the diameter (d) with the formula: C = \pi d.
4.
FLASHCARD QUESTION
Front
What is the area of a semi-circle with radius r?
Back
The area (A) of a semi-circle is given by the formula: A = \frac{1}{2}\pi r^2.
5.
FLASHCARD QUESTION
Front
Calculate the circumference of a circle with a radius of 8 m. Leave your answer in terms of \pi.
Back
C = 2\pi(8) = 16\pi m.
6.
FLASHCARD QUESTION
Front
Calculate the area of a circle with a radius of 7 cm. Leave your answer in terms of \pi.
Back
A = \pi(7^2) = 49\pi cm^2.
7.
FLASHCARD QUESTION
Front
If a circle has a diameter of 10 m, what is its circumference rounded to the nearest tenth?
Back
C = \pi(10) \approx 31.4 m.
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