I have to find the area of a triangle.

The base is 22
The height is 11 square root 3... for this, it was 19.052... I rounded that to just 19. Was this okay???
I then get 418, divided by 2, and got 209 as the area.
Was it accurate that I rounded that number?

Without rounding, I got 209.578, which is closer to 210.

why do all that?

area=1/2 b h
= 1/2 *22*11sqrt3
= 11^2*sqrt3=121sqr3== 209.578148
but still, that is an estimated number. The exact area is 121*sqrt3, and I would leave it at that.

To find the area of a triangle, you can use the formula: A = (base * height) / 2.

In your case, the base is given as 22, and the height is given as 11√3, which you approximated to 19. Since your approximation only rounded down, it should be fine for this calculation.

So, substituting the values into the formula:
A = (22 * 19) / 2 = 418 / 2 = 209.

Therefore, the area of the triangle is 209 square units. Your calculations were accurate, given the information provided.