![]() Role in area and volume calculation īases are commonly used (together with heights) to calculate the areas and volumes of figures. The other two edges can be called the sides. ![]() Sometimes the parallel opposite side is also called a base, or sometimes it is called a top, apex, or summit. Given a fixed base side and a fixed area for a triangle, the locus of apex points is a straight line parallel to the base.Īny of the sides of a parallelogram, or either (but typically the longer) of the parallel sides of a trapezoid can be considered its base. The area of a triangle is its half of the product of the base times the height (length of the altitude). When the triangle is obtuse and the base is chosen to be one of the sides adjacent to the obtuse angle, then the altitude dropped perpendicularly from the apex to the base intersects the extended base outside of the triangle. The extended base of a triangle (a particular case of an extended side) is the line that contains the base. The third vertex opposite the base is called the apex. The two endpoints of the base are called base vertices and the corresponding angles are called base angles. In a triangle, any arbitrary side can be considered the base. Of a triangle The altitude from A intersects the extended base at D (a point outside the triangle). The side or point opposite the base is often called the apex or summit of the shape. This term is commonly applied in plane geometry to triangles, parallelograms, trapezoids, and in solid geometry to cylinders, cones, pyramids, parallelepipeds, prisms, and frustums. ![]() In geometry, a base is a side of a polygon or a face of a polyhedron, particularly one oriented perpendicular to the direction in which height is measured, or on what is considered to be the "bottom" of the figure. Bottom of a geometric figure A skeletal pyramid with its base highlighted
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