Thread: Geometry and assuming help?

http://i8.photobucket.com/albums/a32...olf/angles.jpg

ABC and DEF are straight lines. a = 20, b = 160

1: a + x
2: x + y

A. The quantity in choice 1 is greater.
B. The quantity in choice 2 is greater.
C. The two quantities are equal.
D. The relationship cannot be determined.

The next question uses the same picture but different variables. I'll use the same variables as the above picture for convenience.

Angle a is 30 degrees. Angles b is 150 degrees.

1. (x + y)(degree symbol out here)
2. (Angle symbol) a degrees + (angle symbol) b degrees.

A. The quantity in choice 1 is greater.
B. The quantity in choice 2 is greater.
C. The two quantities are equal.
D. The relationship cannot be determined.

I'm pretty sure the second cannot be determined since it doesn't say that the lines are straight. I'd like a second opinion though.

Originally Posted by Rinnie

http://i8.photobucket.com/albums/a32...olf/angles.jpg

ABC and DEF are straight lines. a = 20, b = 160

1: a + x
2: x + y

A. The quantity in choice 1 is greater.
B. The quantity in choice 2 is greater.
C. The two quantities are equal.
D. The relationship cannot be determined.

recall that angles on a straight line add up to 180 degrees.

can you do the problem now?

The next question uses the same picture but different variables. I'll use the same variables as the above picture for convenience.

Angle a is 30 degrees. Angles b is 150 degrees.

1. (x + y)(degree symbol out here)
2. (Angle symbol) a degrees + (angle symbol) b degrees.

A. The quantity in choice 1 is greater.
B. The quantity in choice 2 is greater.
C. The two quantities are equal.
D. The relationship cannot be determined.

I'm pretty sure the second cannot be determined since it doesn't say that the lines are straight. I'd like a second opinion though.

if the questions are somehow connected, i think we can assume we are dealing with straight lines again, in which case, follow my previous hint

I have that the first problem the quantities are equal. Are you allowed to assume that a = 20 means degrees? Also, I think that the second one is the opposite. The fact that the first one said it was a straight line and the second one doesn't seems to imply that they're intending to trick or show a different example of.