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