Area and Circumference of Circles

Area and Circumference of Circles

Assessment

Flashcard

Mathematics

7th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

2.

FLASHCARD QUESTION

Front

What is the formula for the circumference of a circle?

Back

Circumference = πd or Circumference = 2πr, where d is the diameter and r is the radius.

3.

FLASHCARD QUESTION

Front

If a circle has a radius of 7 cm, what is its area?

Back

154 cm² (Area = π(7)² = 154 cm²).

4.

FLASHCARD QUESTION

Front

If a circle has a diameter of 10 m, what is its circumference?

Back

31.4 m (Circumference = πd = π(10) = 31.4 m).

5.

FLASHCARD QUESTION

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

6.

FLASHCARD QUESTION

Front

How do you find the radius if you know the circumference?

Back

Radius = Circumference / (2π).

7.

FLASHCARD QUESTION

Front

What is the area of a circle with a diameter of 12 inches?

Back

113.1 in² (Area = π(6)² = 113.1 in²).

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