Question

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The chemistry teacher decides to use chalk paint to cover a circular portion of a wall in the science lab. If the greatest distance across the circle is is 3 feet, approximately how many square feet will the chalk paint cover?
A) 5 ft²
B) 7 ft²
C) 9 ft²
D) 11 ft²

Answer 1

Answer:

7 ft^2

Step-by-step explanation:

diameter is the largest distance

therefore

r=1.5 feet

are of circle = πr^2

22/7*1.5*1.5

=7.07 ft^2

therefore we need approximately 7 ft^2 of chalk paint

Answer 2

The chemistry teacher uses approximately B) 7 ft² area on the board.

Given:

The chemistry teacher decides to use chalk paint to cover a circular portion of a wall in the science lab. The greatest distance across the circle is 3 feet.

To find:

Approximately how many square feet will the chalk paint cover?  

Solution:

From the data,

The greatest distance across the circle is 3 feet

This implies the diameter of the circle is 3 feet

Since the radius of the circle = diameter/2

Radius of the circle portion = 3ft/2 = 1.5 ft  

Using the formula,

Area of circle = πr²

Area of the circle portion = π(1.5)² = 7.07 ft

Therefore,

The chemistry teacher uses approximately B) 7 ft² area on the board.

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