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Big Ideas Math Integrated II View details

Chapter Review

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Exercise 1 Page 694

Recall the formula for finding circumference of a circle.

≈ 30ft

Practice makes perfect

Consider the given circle.

From the figure, we know that the circumference of the circle is 94.24 feet. The circumference C of a circle with radius r is calculated using the formula below. C=2π r

Let's substitute 94.24 for C in the formula and solve the equation for r.

C=2 π r

Substitute

C= 94.24

94.24=2π r

▼

Solve for r

DivEqn

.LHS /2.=.RHS /2.

47.12=π r

DivEqn

.LHS /π.=.RHS /π.

47.12/π=r

UseCalc

Use a calculator

14.99876...=r

RoundInt

Round to nearest integer

15≈ r

RearrangeEqn

Rearrange equation

r≈15

We found that the radius of the circle is about 15. Now, to find the diameter, we can multiply the radius by 2. 15* 2=30ft The diameter of the circle is about 30 feet.

Subchapter links

1 Circumference and Arc Length p.694

2 Areas of Circles and Sectors p.694

3 Areas of Polygons p.695

4 Volumes of Prisms and Cylinders p.696

5 Volumes of Pyramids p.697

6 Surface Areas and Volumes of Cones p.698

7 Surface Areas and Volumes of Spheres p.698

Exercise 1 Page 694

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