Download - Math Vocabulary Unit 5 1
Math VocabularyUnit 5 1
GeometryBy Jim Auld
Angles• Right
90°
Angles• Acute
An angle measuring less than 90°
Angles• Obtuse
An angle measuring more than 90° and less than 180°
TrianglesThe Sum of all the angles = 180°• Equilateral Triangle
A triangle with 3 congruent sides
TrianglesThe Sum of all the angles = 180°• Scalene Triangle
A triangle with NO congruent sides
TrianglesThe Sum of all the angles = 180°• Isosceles Triangle
A triangle with two congruent sides
TrianglesThe Sum of all the angles = 180°• Right Triangle
A triangle with one right angle (90°)
QuadrilateralsThe Sum of all the angles = 360°
• A four-sided polygon
Quadrilaterals The Sum of all the angles = 360°• Parallel
Two Lines that never intersect
Quadrilaterals The Sum of all the angles = 360°• Rectangle
2 parallel sides4 Right Angles
Quadrilaterals The Sum of all the angles = 360°• Square
2 Parallel sides4 Right Angles4 Equal sides
Quadrilaterals The Sum of all the angles = 360°• Rhombus
A parallelogram whose four sides are congruent and whose opposite angles are congruent
Quadrilaterals The Sum of all the angles = 360°• Trapezoid
A quadrilateral with exactly one pair of parallel sides
Quadrilaterals
• ParallelogramA quadrilateral with
opposite sides are parallel and congruent
Regular Polygons
• A polygon with all sides and all angles equal
Regular Polygons
• PentagonA five-sided polygon. The sum of the angles of
a pentagon is 540 degrees.
Regular Polygons
• HexagonA six-sided polygon. The sum of the angles
of a hexagon is 720 degrees.
Regular Polygons
• HeptagonA seven-sided
polygon. The sum of the angles
of a hexagon is 900 degrees.
Regular Polygons
• OctagonAn eight-sided polygon. The sum of the angles of
an octagon is 1080 degrees.
Regular Polygons
• DecagonA ten-sided polygon. The sum of the angles of
a decagon is 1440 degrees.
Regular Polygons
• Convex A figure is convex if every line segment drawn between any two points inside the figure lies entirely inside the figure.
Math VocabularyUnit 5 2
GeometryBy Jim Auld
Investigation 2
• Perimeter The perimeter of a polygon is the distance around the outside of the polygonL + L + W + W = P
Investigation 2
• Area The number of square units it takes to completely fill a polygon.
L x W = A
Investigation 2
• Dimension The measurement of a polygon. Example: Length, Width or Height.
Investigation 2
• Similar Polygons that have the same shape, not necessarily the same size they are similar.