-21-10+25=-6
-6=-6
its true
hi
As the triangle is equilateral, the height is also the median.
As the median cut the side in two equal halve, and one of this half is 9, then the side is 18.
As the triangle is equilateral, every side is the same measure, so x = 18
Instead of trying to find the exact answer on the internet, I would suggest looking up how to turn decimals into fractions. But I will give you a hint, it would be a mixed number
