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28 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Polygon definition |
A closed figure made by joining line segments, where each line segment intersects exactly 2 others |
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Why is this not a polygon? |
It is not made of line segments |
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Why is this not a polygon? |
It is not a closed figure |
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It's sides do not intersect in exactly 2 places each |
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Regular Polygon Definition |
The sides and angles are the same size. The sum of the angles of a polygon with "n" sides is 180° × (n-2) |
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Vertex definition |
The point where the 2 rays that form the angle intersect |
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Vertices definition |
The points where it's sides intersect |
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Triangle definition |
3-sided polygon. The sum of the angles is 180° |
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Equilateral Triangle |
All 3 sides are equal. All angles = 60° |
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Isosceles Triangle |
2 sides of equal length |
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Scalene Triangle |
3 sides of different lengths |
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Acute Triangle |
3 acute angles |
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Obtuse Triangle |
1 angles is obtuse (more than 90°) |
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Right Triangle |
One angle = 90°. Side opposite right angle is called the hypotenuse 2 sides that form right angles are called the legs |
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Quadrilateral definition |
4-sided polygon. The sum of the angles = 360° |
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Rectangle |
Quadrilateral All right angles. |
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Square |
Quadrilateral Equal-length sides meeting at right angles |
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Parallelogram |
Quadrilateral 2 pairs of parallel sides |
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Rhombus |
Quadrilateral Equal-length sides |
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Trapezoid |
Quadrilateral Exactly 1 pair of parallel sides. 2 parallel sides are called the bases |
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Pentagon |
5-sided. The sum of the angles = 540° |
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Hexagon |
6-sided. The sum of the angles = 720° |
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Heptagon |
7-sided. The sum of the angles = 900° |
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Octagon |
8-sided. The sum of the angles = 1080° |
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Nonagon |
9-sided. The sum of the angles = 1260° |
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Decagon |
10-sided. The sum of the angles = 1440° |
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Convex figure |
Every line segment drawn between any 2 points inside the figure lies entirely inside the figure |
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Concave figure |
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