Hello, please help me solve this

Question

What is the area of the top of a jar if the diameter of the jar is 3.00 inches?

Answer 1

Hi Iris,

If a diameter is given for the top of the jar, then it is shaped like a circle.

The area of a circle is A = πr², where r is the radius of the circle. The radius is exactly half the diameter, so in this case, it's 1.50 inches.

Substituting for r, you get

A = π(1.50 in)² = 7.07 in²

Answer 2

Start with the formula for the area of a circle: area = (pi)(radius)²

 

Then remember to divide the diameter in half to get the radius (3.00/2 = 1.50)

 

Then plug in the numbers:

area = (3.14)(1.50)²

area = (3.14)(2.25)

area = 7.065 square inches

 

To round it to the nearest hundreth (thank you, Steve!) if you normally do that: 7.07 square inches