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°
ReplyDeletehttp://mate-facil.co.cc/go-geometry-181/
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.
ReplyDeletehttp://img31.imageshack.us/img31/1804/problema181resuelto.png
ReplyDeleteGreetings ^^
Three solutions :)
ReplyDeletehttp://youtu.be/Djygod0XGdk
Greetings ^^
Join OC
ReplyDeleteLet <COB=2y
OC=OB
<OCB=90-y
<AOC=90-2y
OC=OA
<OCA=45+y
x=<OCB+<OCA=135