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Activity 3.8
Assignment 3.9
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Assignment 10.17
Area of a Sector of a Circle
Objective
Develop and apply methods and formulas for finding the area of sectors of circles.
Assignment 10.18
Assignment 10.16
About Geometry Worksheet Assignment 10.17: This assignment can be downloaded for free.
Assignment 10.17 is an introduction to areas of sectors of circles.
Prerequisite Skills: Calculate the area of a circle (Assignment 10.16). Identify the radius of a circle (Assignment 10.1). Identify arc measures (Assignment 10.8).
Definition: A sector of a circle is a region enclosed by a central angle and its intercepted arc.
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Theorems: The formula for the area of a sector of a circle with arc measure a is: A = a r
360
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The formula for the area of a semicircle is: A = 1 r
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The formula for the area of a sector in which the central angle is a right angle is: A = 1 r
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