# The World’s Hardest Easy Geometry Problem

March 5, 2012 37 Comments

Every once in a while a math problem takes the world by storm … at least the world of nerds. About five years ago, the “World’s Hardest Easy Geometry Problem” hit the internet. Not that this problem was new or unique. After all, it has been around for hundreds of years. However, with the speed and ease of communication of the internet, the problem spread like wildfire. In fact, according to rumors, the problem was so addictive that the whiteboards in the offices of Google were filled with attempted solutions. As the story goes, one employee said that the problem probably cost Google about a quarter of a million dollars in lost time.

What was the problem that people couldn’t stop thinking about? Think you can solve it? Enjoy … and no cheating! (For a PDF version of the problem, click World’s Hardest Easy Geometry Problem.)

Pingback: Welcome to Musings on Math! « Musings on Math

he value of X is 10degrees, considering the given measures for size which is 60° 20° and 10° and 70°

So basically each given side is 80°,

To find value of x add the amount of each given side, then minus the subordinate, and you’ll solve x which is 10°

I can also give you y

Which is 60°

Unfortunately, x is not 10 degrees. Sorry.

x=10 degrees ,easy and simple

It isn’t 10 degrees. Sorry.

X=#### degrees n I’m a grade 10 learner am I correct?

You are correct! I changed your comment to remove the correct answer so others won’t know what it is. Nicely done!

Thanks sir are there any rewards for the solution

Unfortunately, no – just the satisfaction of a job well done! If you are looking for an unsolved math problem with a cash prize, you should read my post: https://musingsonmath.com/2010/11/25/want-to-earn-some-extra-money/

15 degrees?

Unfortunately, you are also incorrect. Sorry.

Is it 60 degrees. ^)^)^)^)^)^)^)^)^)^)^)^)^)^)^)^)^)^)^).

No. Sorry.

Is it 90 degrees?

No. Sorry.

Sorry I believe there might be an inconsistency here. If angle A and angle B are each 80 degrees, C must be 40 degrees. This means that in triangle ACE, angle E must be 130 degrees. Now, if you were to solve for E a different way: If you solve for the bottom triangle, you would have one angle 70 degrees and 80 degrees (given), and the remaining angle must be 50 degrees. Using supplementary angle law, we know that the two angles next to it must be 130 degrees. Using this, we solve triangle BEX(X is the middle point with the 50 degree and 130 degree angle), we find that E is equal to 30 degrees. Using supplementary angle, we find that angle E in triangle ACE must also be 150 degrees (180 – 30 degrees). This means that E is equal to either 150 degrees or 130, which is an inconsistency. I checked my math so I think that is the case, but if it isn’t, can you please let me know?

The issue with the problem is that it is not drawn to scale. The diagram is intentionally misleading. As such, there are certain results that will appear correct until the diagram is drawn to scale. I hope this helps a little bit.

x=80 degrees? I took geometry last year so I’m curious if I’m correct. I hope I am or I just might make myself retake it lol

Unfortunately, you are incorrect. Sorry.

i guess it’s ## degree

You are correct! I deleted your answer from your comment so others would not know the answer.

i guess its ## degree …

You are correct! I removed your answer so others wouldn’t know the answer.

is it 70

I am sorry but that is incorrect. Don’t give up!

Is it 30° ? I’m in grade 8

Unfortunately, that is incorrect. But keep trying!

The answer is ##

You are correct! I removed your answer so others wouldn’t know the answer.

Is it ## degrees?

You are correct! I removed your answer so others wouldn’t know the answer.

Is it ## degrees.?

You are correct! I removed your answer so others wouldn’t know the answer.

x=70, am i correct?

Unfortunately, you are incorrect. Try again.

is it x=#### degrees?

You are correct. I removed your answer from the post so others wouldn’t know what the answer is.