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.
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