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Acc. 10.2.notebook
April 08, 2013
DO NOW
1. Find the side lengths and classify the
triangle by its side lengths.
p = 69"
2. The ratio of the angle measures of a
triangle is 14 : 31 : 45. Find the angle
measures. Then classify the triangle by its
angle measures.
Mar 22­6:33 PM
10.2 Polygons & Quadrilaterals
A polygon is a closed plane figure whose sides are segments
that intersect only at their endpoints. In a regular polygon,
all the sides have the same length and all the angles have
the same measure.
Mar 22­6:55 PM
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Acc. 10.2.notebook
April 08, 2013
A polygon is convex if a segment joining any two
interior points lies completely within the polygon. A
polygon that is not convex is called concave.
Mar 22­6:58 PM
Names of other polygons:
The name n-gon refers to a polygon that has n sides.
For example, a 15-gon is a polygon that has 15 sides.
Mar 22­7:00 PM
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Acc. 10.2.notebook
April 08, 2013
Tell whether the figure is a polygon. If it is a polygon,
classify it and tell whether it is convex or concave.
Mar 22­7:02 PM
Quadrilaterals
Some quadrilaterals have special names based on whether
they have parallel or congruent sides and whether they have
right angles.
Mar 22­7:07 PM
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Acc. 10.2.notebook
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Mar 22­6:58 PM
Remember the symbols
for congruent and
parallel sides.
Classify the quadrilateral.
Mar 22­7:11 PM
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Acc. 10.2.notebook
April 08, 2013
A diagonal of a polygon is a segment that joins two
vertices that are not adjacent. You can use a diagonal
of a quadrilateral to show that the sum of the angle
measures in a quadrilateral is 360º.
Mar 22­7:14 PM
Find the value of x.
Mar 22­7:54 PM
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April 08, 2013
When classifying a quadrilateral, what
characteristics do you look for?
1.
2.
3.
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