# Distinguishing Between the Area and Circumference of a Circle

In this lesson, we distinguish between the area and circumference of a circle using real world problems.

Rhea wants to make a round photo frame for her sister. The radius of the photo frame is 10.2 cm. What is the circumference of photo frame?

### Solution

**Step 1:**

Given radius r = 10.2 cm

**Step 2:**

Circumference of Photo frame = 2πr = 2(3.14)10.2 = 64.06 cm

Eva makes a round pizza. If the cake is 6.4 inches in radius, how many square inches of cheese layer does she need to put on the pizza?

### Solution

**Step 1:**

Given radius r = 6.4 in

**Step 2:**

Area of Cheese layer = πr^{2} = (3.14)(6.4)(6.4) = 128.61 square inches

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