See complete Problem 181 at:

www.gogeometry.com/problem/p181_circular_sector_90_angle.htm

Circular Sector of 90 degrees, find an angle. Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

## Monday, September 22, 2008

### Elearn Geometry Problem 181

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x=(360°-90°)/2=135°

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ReplyDeleteBy TiNo

let us draw the complete circle, then the chord AB will subtend an angle equal to (1/2)*90 = 45 degrees on the major arc. let one such point be D then ACBD form a cyclic quadrilateral with angles ACB and ADB being supplementary. so angle ACB = 180-45 = 135 degrees.

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ReplyDeleteGreetings ^^

Three solutions :)

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Greetings ^^