MEAP REVIEW. A polygon is a closed figure whose sides are made up of straight line segments that do...

CLASSIFYING TRIANGLES AND

POLYGONS

MEAP REVIEW

Polygons

A polygon is a closed figure whose sides are made up of straight line segments that do not cross.

Naming Polygons

Classifying Quadrilaterals

Quadrilaterals are four-sided polygons.

Trapezoids have exactly one pair of parallel lines.

Parallelograms have two pairs of parallel lines.

There are three special kinds of parallelograms:

A rectangle has four right angles. A rhombus has

four congruent sides.

A square has four right angles and four congruent sides.

Classifying by Angle

• Acute triangles have three acute angles.

• Obtuse triangles have one obtuse angle.

• Right triangles have one right angle.

Classifying by Sides

• Equilateral triangles have three congruent sides.

• Isosceles triangles have two congruent sides.

• Scalene triangles have zero congruent sides.

Finding Missing Angles• The three angles of a triangle always

add to 180°.

• Use a variable to stand for the missing angle and set an equation equal to 180.

x + 49 + 47 = 180x + 96 = 180 – 96 = -96

x = 84

Homework Time!

MEAP REVIEW. A polygon is a closed figure whose sides are made up of straight line segments that do...

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