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1. ### How to prove this is a right angle?

By drawing out exactly what you described, we see that angle AEC subtends arc AOC. Since since AOC is the diameter...

3 Answers · Science & Mathematics · 03/06/2013

... you do, you will see that triangle ADF is similar to triangle AEC (they're both right triangles, and they share angle A) ...

1 Answers · Science & Mathematics · 19/03/2014

3. ### Geometry help: right triangle inscribed in a circle with a tangent and angle bisector?

...and BCD are congruent [bisection of angle ACB] Triangles AEC and BDC are similar [angle-angle similarity] Angle AEC...

3 Answers · Science & Mathematics · 21/05/2013

4. ### Linear Algebra Problem?

... in H. That is (ab^(-1))(bc^(-1)) = ab^(-1)bc^(-1) = aec^(-1) = ac^(-1) ∈ H. (Used the associativity property there in the middle...

1 Answers · Science & Mathematics · 15/05/2013

5. ### chords AB and CD intersect at E. If m∠AEC = 4x, mAC = 120, and mDB = 2x, what is the value of x?

Draw the diagram to show the geometry. m∠AEC = 4x, mAC = 120, and mDB = 2x. There is an ...

2 Answers · Science & Mathematics · 27/03/2013

6. ### A question on angles?

in the given figure ABDE is a trapezium where AE & DB are parallel so alternate angles are equal angle x = angle DCE = angle AEC = 49 degrees.....................answer

1 Answers · Science & Mathematics · 16/03/2013

<AEC + <B = <AEC + <D...

1 Answers · Science & Mathematics · 22/02/2013

8. ### What does a number mean before an angle?

Yes, 3m∠BEC means to multply ∠BEC by three. "m" is read "measure". So 3m∠BEC is simply 3 times the measure of ∠BEC.

2 Answers · Science & Mathematics · 10/02/2013

9. ### Help with Mathematics?

... So triangle ACE is isosceles with angle ACE = angle AEC Triangle BCE and triangle FEC are congruent (by the side...

1 Answers · Science & Mathematics · 23/01/2013