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15 Cards in this Set
- Front
- Back
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Polygons |
A polygon is any 2-dimensional shape formed with straight lines. |
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Convex polygon |
A convex polygon is defined as a polygon with all its interior angles less than 180°. This means that all the vertices of the polygon will point outwards, away from the interior of the shape. |
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Concave polygon |
A concave polygon is defined as a polygon with one or more interior angles greater than 180°. It looks sort of like a vertex has been 'pushed in' towards the inside of the polygon. |
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Regular polygon |
A polygon is regular when all angles are equal and all sides are equal. |
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Quadrilaterals |
A quadrilateral can be defined as a closed, two-dimensional shape which has four straight sides. The polygon has four vertices or corners. |
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Square |
A square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles) It can also be defined as a rectangle in which two adjacent sides have equal length. |
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Rectangle |
A 4-sided flat shape with straight sides where all interior angles are right angles (90°). Also, opposite sides are parallel and of equal length. |
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Trapezium |
A trapezium, is a four-side geometrical shape or quadrilateral, with the condition that two of the four sides must be parallel. If you think about it, a square and a rectangle would also fall into this category, except that they have the other pair of sides also parallel. |
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Rhombus |
A Rhombus is a flat shape with 4 equal straight sides. A rhombus looks like a diamond. All sides have equal length. Opposite sides are parallel, and opposite angles are equal (it is a Parallelogram). The altitude is the distance at right angles to two sides. |
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Parallelogram |
A Parallelogram is a flat shape with opposite sides parallel and equal in length. Squares, Rectangles and Rhombuses are all Parallelograms. |
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Kite |
A kite is a quadrilateral whose four sides can be grouped into two pairs of equal-length sides that are adjacent to each other. |
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Adjacent angles |
Two angles are Adjacent when they have a common side and a common vertex (corner point) and don't overlap. |
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Opposite angles |
The angles opposite each other when two lines cross. |
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Angle sum property of quadrilaterals |
The sum of all the interior angles of a quadrilateral is equal to 360 degrees. |
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Diagonals of polygon |
A diagonal of a polygon is a line segment joining two vertices. From any given vertex, there is no diagonal to the vertex on either side of it, since that would lay on top of a side. |
