# 6.1 Polygons 6.2 Properties of Parallelograms - PowerPoint PPT Presentation

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6.1 Polygons 6.2 Properties of Parallelograms. Essential Question: How would you describe a polygon?. Polygons. Plane figure formed by three or more sides. Each endpoint of a side is a vertex . To name a polygon, list its vertices in order.

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6.1 Polygons 6.2 Properties of Parallelograms

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## 6.1 Polygons6.2 Properties of Parallelograms

Essential Question: How would you describe a polygon?

### Polygons

• Plane figure formed by three or more sides.

• Each endpoint of a side is a vertex.

• To name a polygon, list its vertices in order.

### Describing Polygons

• Convex

• Concave; (Hint: side is caved in)

• Equilateral

• Equiangular

• Regular – all angles and sides are the same.

*do #1-13 from overhead

• Diagonal – segment that joins two vertices.

### Interior Angles of a Quadrilateral

• Angles of a quadrilateral add up to 360°.

*problems 14-16 from overhead

### Assignment

• P.325 #4-20, 24-26, 37-39, 41-45

### 6.2 Parallelograms

• Parallelogram- quadrilateral with both pairs of opposite sides parallel

### 4 Properties of Parallelograms

• If a quadrilateral is a parallelogram, then its opposite sides are congruent.

• If a quadrilateral is a parallelogram, then its opposite angles are congruent.

• If a quadrilateral is a parallelogram, then its consecutive angles are supplementary.

• If a quadrilateral is a parallelogram, then its diagonals bisect each other.

### Assignment

• Complete #1-21 from overhead

• P. 333 #2-37 depending on time