Answer:
Let m∠BCE = x
Then m∠ACE = x as well since CE is bisecting ∠ACB.
- m∠ACD + x + x = 180° ⇒
- m∠ACD = 180° - 2x
Consider ΔBEC
<u>Since BE = EC, the opposite angles are congruent:</u>
<u>Then:</u>
<u>Find the angle BEC:</u>
- m∠BEC = 180° - (x + x) = 180° - 2x
<u>Comparing the above we see that:</u>
Answer:
Step-by-step explanation:
<u>The given two points have same x- coordinates, hence the line vertical and is parallel to the y-axis:</u>
Its slope is undefined.
Measurement of angle DEF would equal 180 because 71 plus 109 is 180
Answer:

The number is 8 because 
And if you add 4, you get 20
Hence, the number is 8