Circles (7.9B, 7.9C, 7.5B)
Flashcard
•
Mathematics
•
7th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the definition of a circle?
Back
A circle is a shape consisting of all points in a plane that are a fixed distance (radius) from a central point (center).
2.
FLASHCARD QUESTION
Front
What is the formula for the diameter of a circle?
Back
The diameter (d) of a circle is twice the radius (r): d = 2r.
3.
FLASHCARD QUESTION
Front
What is the value of pi (π)?
Back
Pi (π) is approximately 3.14159 and represents the ratio of the circumference of a circle to its diameter.
4.
FLASHCARD QUESTION
Front
If the radius of a circle is 7 cm, what is its diameter?
Back
The diameter is 14 cm (d = 2r).
5.
FLASHCARD QUESTION
Front
What is the formula for the circumference of a circle?
Back
The circumference (C) of a circle is given by the formula C = 2πr.
6.
FLASHCARD QUESTION
Front
What is the area of a circle with a radius of 3 cm?
Back
The area (A) is approximately 28.27 cm² (A = πr²).
7.
FLASHCARD QUESTION
Front
What is a semicircle?
Back
A semicircle is half of a circle, formed by cutting a whole circle along its diameter.
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