Find the value of x.

X = 60

Step-by-step explanation:

All angles in a triangle have to add up to 180 degrees. Therefore we can set up an equation like this:

Now, all we have to do is solve:

Therefore, x is equal to 60.

We can check this by plugging x into the angles and adding all of them up :

40 + (60 + 20) + 60 = 180

40 + 80 + 60 = 180

120 + 60 = 180

180 = 180

I hope this helps!!

If you have any questions let me know!

- Kay :)

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this is answer of 144 cubic meters