6.

If L1 and L2 are two parallel lines and AB = BC, then

Col A: x

Col B: 60

choices

Col A is big

Col B is big

BOTH r equal

cannot be determined

Results 1 to 5 of 5

- August 14th 2009, 08:27 AM #1

- Joined
- Jul 2009
- Posts
- 57

- August 14th 2009, 08:54 AM #2

- Joined
- Mar 2007
- Posts
- 1,240

Are you sure about the answer-options?

Unless there is further information, specifically a definition of "big", I don't see how one might begin to judge the first two answer-options. (It would be different if they said something like "too big".) And I see no variable "r", so I can't begin to guess what "BOTH r equal" might mean. Sorry.

- August 14th 2009, 08:56 AM #3

- August 14th 2009, 09:06 AM #4

- Joined
- Jan 2008
- From
- Big Stone Gap, Virginia
- Posts
- 2,551
- Thanks
- 12
- Awards
- 1

Hi Bluffmaster.roy.007,

Using alternate interior angles postulate for parallel lines, it's easy to see that the angle formed on the right side of C is also x.

Triangle ABC is isosceles since AB = BC

Angle CAB is 58 degrees since alternate interior angles are congruent.

Angle BCA is also 58 degrees since base angles of an isosceles triangle are equal in measure.

Now you have enough information to find the value of x.

And as Stapel alluded, don't use 'r' when you're trying to say "are". When we see a single letter like that, we think 'variable'. Be very clear when asking your questions. Saves time for us and you.

- August 14th 2009, 09:09 AM #5

- Joined
- Jul 2009
- Posts
- 57