Create>PolyPrimitives>Plane with NO subdivisions. (to make it easy for you)

Now make anequalateral triangle. Can you do it? Here's how you check to see if you're right: Choose Create>Measure Tools>Distance Tool. Snap to curve (hold down c and drag along edge of object) one locator of the distance tool to one point of the triangle and curve snap the other locator of the distance tool to another point on the triangle. If the distance between those two points is the same for all sides of the triangle, you've done it.

*waits for someone to reply*