The word perpendicular mean 2 lines that intersect each other in such a way that the angle between them is 90 degress...=consider the letter ' L ' the vertical line is perpendicular to the horizontal line. because it is making an angle of 90 degree..=
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Lines that are neither parallel nor perpendicular.
A face value in maths is the out-side of the shape, as to say the face of a shape. The face value is the sides of a shape.
division
What symbol
oz = ounce