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(n) :
a figure formed by two rays which start from a common point (a plane angle) or by three planes that intersect (a solid angle); the measure of such a figure. In the case of a plane angle, this is the ratio (or proportional to the ratio) of the arc length to the radius of a section of a circle cut by the two rays, centered at their common point. In the case of a solid angle, this is the ratio of the surface area to the square of the radius of the section of a sphere

"the angle between lines A and B"

"the roof is angled at 15 degrees."

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for angle:

(n) :
a figure formed by two rays which start from a common point (a plane angle) or by three planes that intersect (a solid angle); the measure of such a figure. In the case of a plane angle, this is the ratio (or proportional to the ratio) of the arc length to the radius of a section of a circle cut by the two rays, centered at their common point. In the case of a solid angle, this is the ratio of the surface area to the square of the radius of the section of a sphere

"the angle between lines A and B"

"the roof is angled at 15 degrees."