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Definition
an angle less than 90 degrees but more than 0 degrees 


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Definition
an angle between 90 and 180 degrees 


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Definition


Term

Definition
each angular point of a polygon, polyhedron, or other figure 


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Definition
a straight line from the center to the circumference of a circle or sphere 


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Definition
straight line passing from side to side through the center of a body or figure 


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Definition
the enclosing boundary of a curved geometric figure 


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Definition
of or denoting circles, arcs, or other shapes that share the same center, the larger often completely surrounding the smaller. 


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Definition
a straight line joining the ends of an arc. 


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Definition
each of four quarters of a circle. 


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Definition
the longest side of a right triangle, opposite the right angle. 


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Definition
a threesided regular polygon 


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Definition
a triangle with no two sides of equal length 


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Definition
a triangle with two equal sides 


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a triangle with a right angle. 


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Definition
a plane figure with four equal straight sides and four right angles. 


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Definition
a plane figure with four straight sides and four right angles, esp. one with unequal adjacent sides, in contrast to a square. 


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Definition
a quadrilateral with only one pair of parallel sides. 


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Definition
a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides. 


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Definition
a quadrilateral of which only the opposite sides and angles are equal. 


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Definition
a plane figure with five straight sides and five angles. 


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Definition
a plane figure with six straight sides and angles. 


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Definition
a plane figure with eight straight sides and eight angles. 


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Definition
a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms. 


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Definition
a solid geometric figure with straight parallel sides and a circular or oval section. 


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Definition
a solid or hollow object that tapers from a circular or roughly circular base to a point. 


Term

Definition
a round solid figure, or its surface, with every point on its surface equidistant from its center. 


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Definition
a polyhedron of which one face is a polygon of any number of sides, and the other faces are triangles with a common vertex. 


Term

Definition
a surface or solid formed by rotating a closed curve, esp. a circle, around a line that lies in the same plane but does not intersect it 


Term

Definition
draw (a figure) around another, touching it at points but not cutting it. 


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Definition
draw (a figure) within another so that their boundaries touch but do not intersect. 


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Definition


Term

Definition
a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point. 


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Definition
side by side and having the same distance continuously between them. 


Term

Definition
at an angle of 90° to a given line, plane, or surface. 

