Question

Petra is making a batch of extra large donuts by stamping circles in dough using a pastry stamp with a diameter of 5 inches. For the donut hole, she stamps out a circle using a pastry stamp that has a diameter of 2 inches.

How many square inches of dough are left in the donut after the hole has been removed?

Step 1 - Find the radius of each circle

Step 2 - Find the area of the large circle

Step 3 - Find the area of the small circle

Step 4 - Area of large circle minus area of small circle

Area =
`\pi`²


Describe how you solved this problem using complete sentences and include all relevant formulas and calculations. Use 3.14 for
`\pi`

Answer 1

16.49

Explanation:

First we are going to find the area of the larger circle. You don't need to find the radius, you can just use the diameter(the radius is 2.5). 3.14 times 2.5 squared=19.63. Next, the radius of the smaller circle is 1. So, 3.14 ^1 squared=3.14 19.63 - 3.14= 16.49