# Geometric Proofs= this time for real

• Aug 8th 2009, 12:06 PM
KevinVM20
Geometric Proofs= this time for real
Figure posted below at 3rd post.
1)In the figure above the measure of angle AME is x degrees, then the measure of angle EMB is 180-x degrees.

I don't know why I think this is the answer?I know a straight line is 180 degrees. This is a line adjacent to it.

2) If a central angle is 30 degrees, then the arc it defines is also 30 degrees.

My answer is Properties of a central angle. Because an arc is equal to central angle.

3) If a radius bisects a chord, then the lengths of the parts of the radius on either side of the chord are equal.

This proof is the definition of a radius. But why?

4) If a circle has a central point M, and both point A and point D are on the circle, then ls_MA and ls_MD will be equal.

This is a false proof. Therefore, unfounded?

5) The given points (4, -8), (4, -5), and (-2, -6) make a right triangle

This is also false proof. Does not make a right triangle. Making it an unfounded statement.

Please explain to me more on these subjects. Thanks.
• Aug 8th 2009, 05:18 PM
TKHunny
3 Hint) Construct the line segments from the center of the circle to the ends of the chord.
• Aug 8th 2009, 09:05 PM
KevinVM20

Quote:

Originally Posted by TKHunny
3 Hint) Construct the line segments from the center of the circle to the ends of the chord.

• Aug 8th 2009, 11:30 PM
KevinVM20
• Aug 9th 2009, 11:28 AM
TKHunny
Quote:

Originally Posted by KevinVM20

Well, that kind of attitude will get you some very negative responses.

Please show effort on one and we can talk.
• Aug 9th 2009, 08:35 PM
KevinVM20
I did not intend that to be negative in anyway. I even included a smiley face for all thats worth. Getting through the questions thanks for your consideration.

Quote:

Originally Posted by TKHunny
Well, that kind of attitude will get you some very negative responses.

Please show effort on one and we can talk.

• Aug 9th 2009, 08:50 PM