You can pick any side to be the base. It doesn't really matter.
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any side of the triangle that is perpendicular to the height.
Yes, though generally speaking the bottom, horizontal side (if any) of a triangle is called its base.
the base of a triange would be different depending per triangle. an equilateral can be any side, an isosceles would be the side that is different and a scalene would be the longest.
Area circle: π × radius² Area triangle: ½ × base × height Area Parallelogram: base × height Area: Rectangle: length × width In a triangle, the base is any side between two vertices and the height is the perpendicular distance from this side to the third vertex. In a parallelogram the base is any side. The height is the perpendicular distance between this side and the side parallel to it.
The area of any triangle is: 0.5*base*perpendicular height