Because it intersects the base at a 90 degree angle.
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perpendicular.
First of a;; it is NOT a rectangular solid, but a CUBOID. Thformuloa for calculating volume is baase x perpendicular width x perpendicular height. Algebraically V = l X w X h
half x base x perpendicular heightThe height is called the perpendicular height because it is at a right-angle to the base.
The height is one of the two given measures. For calculating the height of anything perpendicular (90°), a line can be drawn from the highest point of the object to the base.
That is called a line.