Circles - Area and Circumference

Flashcard
•
Mathematics
•
7th Grade
•
Hard
Standards-aligned
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16 questions
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1.
FLASHCARD QUESTION
Front
What is the formula for the area of a circle?
Back
A = πr², where A is the area and r is the radius.
Tags
CCSS.7.G.B.4
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.
Tags
CCSS.7.G.B.4
3.
FLASHCARD QUESTION
Front
What is the radius of a circle?
Back
The radius is a line segment from the center of the circle to any point on its circumference.
4.
FLASHCARD QUESTION
Front
What is the diameter of a circle?
Back
The diameter is a line segment that passes through the center of the circle and connects two points on its circumference. It is twice the length of the radius.
Tags
CCSS.HSG.C.A.2
5.
FLASHCARD QUESTION
Front
If the radius of a circle is 7 cm, what is the area?
Back
A = π(7)² = 49π cm² (approximately 153.94 cm²).
Tags
CCSS.7.G.B.4
6.
FLASHCARD QUESTION
Front
If the diameter of a circle is 20 cm, what is the radius?
Back
Radius = diameter/2 = 20 cm / 2 = 10 cm.
Tags
CCSS.7.G.B.4
7.
FLASHCARD QUESTION
Front
What is the relationship between diameter and radius?
Back
The diameter is twice the radius (d = 2r).
Tags
CCSS.7.G.B.4
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