# Circle and Area

No Calculators: Updated: August 10, 2011

A concave polygon looks sort of like a vertex has been 'pushed in' towards the inside of the polygon.

A convex polygon has all the vertices of the polygon pointing outwards, away from the interior of the shape. Think of it as a 'bulging' polygon.

A regular polygon is a polygon which is equiangular (all angles are congruent) and equilateral (all sides have the same length). Regular polygons may be convex or star.

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1) Describe the figure below. (convex / concave? …) [pic] regular quadrilateral – convex – rhombus - square

2) Describe the figure below. (convex / concave? …) [pic] irregular quadrilateral – convex – trapezoid

3) Describe the figure below. (convex / concave? …) [pic] irregular quadrilateral – concave 4) Describe the figure below. (convex / concave? …) [pic] regular ? – convex – hexagon

5) Describe the figure below. (convex / concave? …) [pic] irregular octagon – concave

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6) Identify the following figure. Be specific as possible using the diagram. [pic] parallelogram

7) Identify the following figure. Be specific as possible using the diagram. [pic] parallelogram – rectangle

8) Identify the following figure. Be specific as possible using the diagram. [pic] rhombus

9) Identify the following figure. Be specific as possible using the diagram. [pic] rectangle – rhombus - square

10) Identify the following figure. Be specific as possible using the diagram. [pic] trapezoid

11) Identify the following figure. Be specific as possible using the diagram. [pic] kite

12) Identify the following figure. Be specific as possible using the diagram. [pic] trapezoid – isosceles trapezoid

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13) A rhombus is a trapezoid. (a) Always (b) Sometimes (c) Never [pic] (c) No, Never A