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Area of a sector

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Problem

A sector with an area of start color #a75a05, 26, pi, start text, c, m, end text, squared, end color #a75a05 has a radius of start color #ca337c, 6, start text, c, m, end text, end color #ca337c.
A circle with a radius of six centimeters. A sector is highlighted. The area is twenty-six pi centimeters squared.
What is the central angle measure of the sector in radians?
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