Math Focus 7

## CHAPTER 5: MEASUREMENT

### Lesson 6: Calculating the Area of a Circle

Use these interactive activities to encourage your child to have fun on the Web while learning about measurement.

Goal

Develop and apply the formula for the area of a circle.

Builds Upon

Student book pages 216–219

Instructions for Use

Interactive Area of a Circle allows your child to explore the relationship between area, radius, and circumference of a circle.

Click and drag a point on the circle. Note how the calculation for area changes when the radius of the circle changes. Recall that the raised 2 after the r means that r is multiplied by itself (r2 = r × r).

Calculating Areas is an online quiz that allows your child to practice calculating the area of a variety of shapes, including circles.

Take this online quiz to show how you are able calculate the area of a variety of shapes. Find the solution to each problem using a paper, pencil and a calculator. Then select your answer from the options given (A, B, C or D). Click the “Check It” button at the end of the quiz to check your answers.