Monday, May 31, 2010

Problem 464: Square, Center, Arc, Angle, 120 Degrees

Geometry Problem
Click the figure below to see the complete problem 464 about Square, Center, Arc, Angle, 120 Degrees.

Problem 464. Square, Center, Arc, Angle, 120 Degrees
See also:
Complete Problem 464

Level: High School, SAT Prep, College geometry

2 comments:

  1. DEC =60° ( DEC equilateral )
    in EGD, DEG = 60°, EDG = 30° ( ADG = 60° - 45°)
    => EGD = 90°
    in EGD, EO, DO bisector ( O center, ODE = 60 - 45° )
    => GO bisector
    => OGD = 45°
    => DOG = 180° - ( 45° + 15°)

    => DOG = 120°

    ReplyDelete
  2. DOC=90deg, DGC=90deg ---> DCG+GOD=180deg.
    DCG=60deg ---> DOG=120deg

    ReplyDelete