A Circle Has a Radius of 9 In

question 21

Multiple Choice

A circle has a radius of 9 in. Find the increase in area when the radius is increased by 3 in. Round to the nearest hundredth.

• A) 113.10 in²
• B) 226.19 in²
• C) 452.39 in²
• D) 197.92 in²
• E) 424.12 in²

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Definitions:

Poles

In electrical engineering, the term refers to the individual magnetic or electrical points that create fields within devices such as motors, or represent the terminals of a battery or generator.

Universal Motor

An electric motor that can operate on both AC and DC power sources, often found in portable power tools and appliances.

Neutral Plane

The point at which there is no voltage induced in the armature of a motor or generator.

Voltmeter

An instrument used for measuring the potential difference, in volts, between two points in an electric circuit.