Honors Geometry Companion Book, Volume 2

9.2.2 Effects of Changing Dimensions Proportionally − Practice

1.  The diagonal length of a kite is multiplied by 8. What is the effect of this change on the area?

2.  The radius of a circle is doubled. What is the effect of this change on the area?

3.  The radius of a circle is multiplied by 1 4 . What is the effect of this change on the area?

4.  A circle has a radius of 5 cm. If the area is tripled, what happens to the circumference?

5.  A circle has a radius of 11.6 in. If the area is multiplied by 16, what happens to the circumference?

6.  An advertiser rents a rectangular billboard that is 21.5 ft wide and 13 ft tall. The rent is $12 per square foot. For a billboard three times as tall, the advertiser has to pay $30,186. Is this reasonable? Explain.

141

Made with FlippingBook - PDF hosting