Yes. Specifically to calculate the area, you take any side as the base, and measure (or calculate, depending on the data provided) the height, perpendicular to that base. You should get the same result in all three cases.
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You can pick any side to be the base. It doesn't really matter.
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.