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An angle whose measure is between 0 and 90, but not including 90. The inside of these prongs form an acute angle.

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An angle whose measure is bigger than 90 but less than 180 degrees. This spider web is an obtuse angle.

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The paper is the plane because it is a flat surface that extends without end and has no thickness.

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Segments that have the same length. The twin towers are congruent segments because of this.

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The area of the region is the sum of its non overlapping parts. The edge of the football field in yellow is the prerimeter.

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If two distinct planes intersect, then they intersect in exactly 1 line. The bride is the crossing point.

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If two distinct lines intersect, then they intersect in exactly 1 point.

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The two outer wood lines on the ladder are parallel because they are always the same distance apart and never touch.

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Each side of this gift is a square.

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The Ferris wheel shape is a circle.

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This is a rectangle because it is a 4-sided flat shape with straight sides where all interior angles are right angles.

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These tortilla chips is a polygon with three edges and three vertices, therefore making it a triangle.

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The stairs the man is walking on forms a right angle, because the measure is 90 degrees.

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These points are coplanar because they all the points (dresser knobs) lay on the same plane.

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These peas are collinear because all the points (peas) are on the same line.

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The edge of this book is like a segment because the line has a starting and end point.

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The edge of this cardboard box is like a line, because it is represented by a straight path that extends in 2 opposite directions without an end and has no certain thickness.

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Earth is like a point because it indicates a location and can be any size.