# Thread: Math question. (Though one)

1. ## Math question. (Though one)

This is a question a teacher showed me.
I, half on my class and some other teachers have been trying to solve it for about a week.
I've drawn it in scale, so I know the answer is 80°, but IDK how to get to it. I've also solved it by analytic geometry, but I needed a scientific calculator to do so.

Can somebody here help solving it the normal way?

Find X:

Thx.

2. ## Re: Math question. (Though one)

That's totally not to scale...

3. ## Re: Math question. (Though one)

It isn't to scale, as the two angles I have outlined below are 20 degrees. Thanks for posting this, though. I need to brush up on my geometry for my Calculus 3 class.

4. ## Re: Math question. (Though one)

I know it's not on scale, but all that is needed to solve are the angles.

BTW, that angle you marked as 20° is actually 110°

5. ## Re: Math question. (Though one)

Originally Posted by smartboyathome
It isn't to scale, as the two angles I have outlined below are 20 degrees. Thanks for posting this, though. I need to brush up on my geometry for my Calculus 3 class.
That isn't right either (or I can't decipher the pic). That would make the angle measure of a line 90 degrees, but it should be 180.

EDIT: Some totally obvious first steps...
Last edited by cardinals_fan; March 28th, 2009 at 02:27 AM.

6. ## Re: Math question. (Though one)

Originally Posted by cardinals_fan
That isn't right either (or I can't decipher the pic). That would make the angle measure of a line 90 degrees, but it should be 180.
Like I said, I need to brush up on my geometry. I can't even remember that, yet I'm in Calc 3.

7. ## Re: Math question. (Though one)

I am sooo glad I never had to do stuff like this in school.

8. ## Re: Math question. (Though one)

Originally Posted by cardinals_fan
That isn't right either (or I can't decipher the pic). That would make the angle measure of a line 90 degrees, but it should be 180.

EDIT: Some totally obvious first steps...
Yeah, I got that far an I am now stuck.

9. ## Re: Math question. (Though one)

Originally Posted by Marlonsm
This is a question a teacher showed me.
I, half on my class and some other teachers have been trying to solve it for about a week.
I've drawn it in scale, so I know the answer is 80°, but IDK how to get to it. I've also solved it by analytic geometry, but I needed a scientific calculator to do so.

Can somebody here help solving it the normal way?

Find X:

Thx.
I for one would not like to find X, becuase i like tty terminals. I wish i could help you though, sadly I am only in 8th grade

10. ## Re: Math question. (Though one)

It's been a while since I've tackled anything quite like this (about 30 years), and I might need to sit down and think for a bit, but suspect that the two following nuggets will be of help:
• The internal angles of a triangle add up to 180 degrees
• The angles on a straight line also add up to 180 degrees

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