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1. ### This is really tough geometry problem?

... cyclic, ABC + A1EC1 = 180, so we end up with a + b = 60, or AEC = 120. Using the cosine law for the area of the triangle AEC gets...

2 Answers · Science & Mathematics · 24/11/2007

2. ### If AB is parallel to CD. SIMPLE!???

...angle is 90-45 = 45 since the angles of the triangle add to 180, angle AEC is 180°-55°-45° = 80°

5 Answers · Science & Mathematics · 15/10/2007

3. ### In the figure above AC||EF, BF||AE, BD = DF, AC = EC and ˆ F = 50 degrees?

...also 50 Triangle ACE is isosceles; since BAE = 50, AEC is also 50. Since ABDE is an isosceles trapezoid, ...

1 Answers · Science & Mathematics · 03/10/2008

4. ### Circle Geometry 2 .?

... standing on AB: 72°/2 = 36° Similarly, angle AEC at the circumference is half angle AOC at the centre since they...

1 Answers · Science & Mathematics · 13/09/2009

5. ### Geometry Help Needed Bad!?

... any sense)] 4) mangAEB = mangCED [Because angle AEC overlaps a part of angle BED so subtract that shared portion...

3 Answers · Science & Mathematics · 26/02/2011

6. ### math problem, help me out please?

It's C since they're perpendicular at E the angle AEC would be 90º

4 Answers · Science & Mathematics · 05/09/2010

7. ### A simple geometry problem. Anyone willing to help?? Involves area of triangles.?

.... By a similar reasoning, BC ≅ AC if ∠AEC ≅ ∠BEC. How then would those pairs of angles be congruent...

2 Answers · Science & Mathematics · 22/09/2010

8. ### Geometry Help Fast Please! - Circles?

... the measure of Arc AC = 100 and the Measure of angle AEC = 70 find the measure of Arc BD. Angle AEC = Angle...

1 Answers · Science & Mathematics · 06/06/2010

9. ### What did I do wrong?

... Rule and the Quadratic Formula. In triangle AEC, let AE = x, then, noting that EC = r and AC = 3r, we...

4 Answers · Science & Mathematics · 04/03/2007

...120°. So the exterior angle is 180-120 = 60°. 3. a) m<AEC + m<AED = 180, so 2x + 10 + 3x - 30 = 180 => 5x = 200 =>...

1 Answers · Science & Mathematics · 06/05/2007