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This wood block is a rectangle, a shape with 4 straight sides and 4 right angles.

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This wood block is a triangle, a shape with 3 sides and 3 angles.

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This lego is a square, a shape with 4 equal sides and 4 right angles.

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A straight angle is an angle whose measure is exactly 180 degrees (it's just a line) like the spot where the ceiling meets the wall.

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The spot where the ceiling meets the wall is a line.

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An obtuse angle is an angle whose measure is greater than 90 but less than 180, like this section of a windmill.

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An acute angle is an angle whose measure is between 0 and 90, like this slice of pizza.

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A midpoint divides a segment into 2 congruent segments, like this point on this shelf.

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Congruent segments are line segments with the same length, like the edges of this square on my closet.

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A segment bisector intersects another line at the midpoint like this part of my shelf.

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If two distinct planes intersect, then they intersect in exactly 1 line. These two sections of a shelf intersect in exactly 1 line.

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Parallel lines are lines that never meet, likes these blinds.

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A line segment is a part of a line that has 2 endpoints. The edge of this ruler is a line segment.

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A right angle is any angle whose measure is exactly 90 degrees, like the corner of my closet.

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If two distinct lines intersect, then they intersect in exactly 1 point. This design on this chair has 2 lines that intersect at only 1 point.

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Collinear points are points that belong on the same line. These three points are on the same line.

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A plane is represented by a flat surface that extends without end and has no thickness. This wall is as close as I could get.

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A point indicates a position and has no size.
This star is a point.