Area of Circles
Flashcard
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the formula for the area of a circle?
Back
The area of a circle is calculated using the formula A = πr², where A is the area and r is the radius.
2.
FLASHCARD QUESTION
Front
What does π (pi) represent in the context of circles?
Back
π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.
3.
FLASHCARD QUESTION
Front
If the radius of a circle is 5 cm, what is its area?
Back
Using the formula A = πr², the area is A = 3.14 * (5)² = 78.5 cm².
4.
FLASHCARD QUESTION
Front
What is the area of a circle with a diameter of 10 cm?
Back
First, find the radius (r = diameter/2 = 5 cm). Then, A = πr² = 3.14 * (5)² = 78.5 cm².
5.
FLASHCARD QUESTION
Front
How do you find the radius if you know the area of a circle?
Back
You can rearrange the area formula: r = √(A/π). For example, if A = 78.5 cm², then r = √(78.5/3.14) = 5 cm.
6.
FLASHCARD QUESTION
Front
What is the area of a semicircle with a radius of 4 cm?
Back
The area of a semicircle is half the area of a circle: A = (1/2) * πr² = (1/2) * 3.14 * (4)² = 25.12 cm².
7.
FLASHCARD QUESTION
Front
What is the area of a circle with a radius of 10 m?
Back
Using the formula A = πr², the area is A = 3.14 * (10)² = 314 m².
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