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Transcript
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
The figure shows two semicircles and a quarter of a circle.
Find the area of the shaded region. Use .  for .
Be sure to include the formula and all of the steps you took to
solve the problem! Organize your work!

A triangle is a figure with three sides and
three angles. The symbol for triangle is .


Every triangle has at last two acute angles.
One way to classify triangles is by using the
third angle.
Another way to classify triangles is by their
sides. Sides with the same length are
congruent segments.

The figure below is a quadrilateral, since it
has four sides and four angles.
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

A polygon is a simple, closed figure formed
by three or more straight line segments.
A simple figure does not have lines that cross
each other.
You have drawn a closed figured when your
pencil ends up where it started.

A polygon can by classified by the number of
sides it has.



An equilateral polygon has all sides
congruent.
A polygon is equiangular if al of its angles are
congruent.
A regular polygon is equilateral and
equiangular, with all sides and all angles
congruent.

Determine whether each figure is a polygon.
If it is, classify the polygon and state whether
it is regular. If it is not a polygon, explain why.

Determine whether each figure is a polygon.
If it is, classify the polygon and state whether
it is regular. If it is not a polygon, explain why.