Area of Crircles

Area of Crircles

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

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

If the radius of a circle is 5 cm, what is its area?

Back

A = π(5 cm)² = 25π cm² ≈ 78.5 cm².

3.

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.

4.

FLASHCARD QUESTION

Front

How do you find the radius if you know the area of the circle?

Back

To find the radius, rearrange the area formula: r = √(A/π).

5.

FLASHCARD QUESTION

Front

What is the area of a circle with a diameter of 10 inches?

Back

First, find the radius: r = diameter/2 = 5 inches. Then, A = π(5 inches)² = 25π inches² ≈ 78.5 inches².

6.

FLASHCARD QUESTION

Front

What is the area of a circle with a radius of 3 m?

Back

A = π(3 m)² = 9π m² ≈ 28.3 m².

7.

FLASHCARD QUESTION

Front

If the area of a circle is 50.3 cm², what is the radius?

Back

Using the formula r = √(A/π), r = √(50.3/π) ≈ 4.0 cm.

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