Area and circumference
Flashcard
•
Mathematics
•
9th - 12th Grade
•
Hard
Standards-aligned
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15 questions
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1.
FLASHCARD QUESTION
Front
What is the formula for the circumference of a circle?
Back
C = 2πr, where C is the circumference and r is the radius.
Tags
CCSS.7.G.B.4
2.
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
3.
FLASHCARD QUESTION
Front
If a circle has a radius of 5 cm, what is its circumference?
Back
C = 2π(5) = 10π or about 31.4 cm.
Tags
CCSS.7.G.B.4
4.
FLASHCARD QUESTION
Front
If a circle has a radius of 7 mm, what is its area?
Back
A = π(7)² = 49π or about 153.94 mm².
Tags
CCSS.7.G.B.4
5.
FLASHCARD QUESTION
Front
What is the relationship between diameter and radius?
Back
Diameter (d) = 2 × Radius (r).
Tags
CCSS.7.G.B.4
6.
FLASHCARD QUESTION
Front
If a circle has a diameter of 20 cm, what is its radius?
Back
Radius (r) = Diameter (d) / 2 = 20 cm / 2 = 10 cm.
Tags
CCSS.7.G.B.4
7.
FLASHCARD QUESTION
Front
What is the circumference of a circle with a radius of 12.5 mm?
Back
C = 2π(12.5) = 25π or about 78.5 mm.
Tags
CCSS.7.G.B.4
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