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Devin B.

A simple, closed 2- Dimensional shape made up of straight lines.

A polygon with exactly 4 sides.

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A quadrilateral that has 2 sets of adjacent and congruent sides.

A parallelogram with 4 congruent sides.

Two angles whose sum is 90 degrees.

Two or more lines that never intersect and lie in the same plane

A 3-D solid made up of a collection of polygons joined together at their edges.

The exact half of a sphere.

The height of a triangle or a perpendicular segment from a vertex to its opposite side

A line joining a vertex to the midpoint of the opposite side

The point in the middle of a line segment (same distance from each endpoint)

A circle that contains a figure inside with all vertices of the figure are points on the circle.

The point where the altitudes of a triangle intersect.

A polygon with exactly 3 sides

A quadrilateral with 2 pairs of parallel sides.

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A quadrilateral with one pair of parallel sides.

Two angles whose sum is 180 degrees.

Two lines that come together to form a right angle.

Polygons with the same angles and all corresponding sides are the same.

Two lines intersected by a thrid line.

The angle formed by the union of polygonal regions in space that share the same edge.

A polygon with 12 sides.

To cut in half to form two equal parts finding the midpoint.

The triangle formed when joining the three midpoints of the sides of a triangle.

A line segment that divides an angle into two congruent angles.

The point where perpendicular lines intersect.

The point where the medians of a triangle intersect.

Two chords of an a circle sharing an endpoint.

A 2-D representation of a 3-D figure that will fold into the 3-D shape.

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