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Explore fundamental geometry terms such as angles, triangles, quadrilaterals, regular polygons, and more in this comprehensive unit. Learn definitions, properties, and formulas to enhance your understanding of geometric shapes and figures.
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Math VocabularyUnit 5 1 Geometry By 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 sides • 4 Right Angles
Quadrilaterals The Sum of all the angles = 360° • Square • 2 Parallel sides • 4 Right Angles • 4 Equal sides
Quadrilaterals The Sum of all the angles = 360° • A parallelogram whose four sides are congruent and whose opposite angles are congruent • Rhombus
Quadrilaterals The Sum of all the angles = 360° • A quadrilateral with exactly one pair of parallel sides • Trapezoid
Quadrilaterals • A quadrilateral with opposite sides are parallel and congruent • Parallelogram
Regular Polygons A polygon with all sides and all angles equal
Regular Polygons • A five-sided polygon. • The sum of the angles of a pentagon is 540 degrees. • Pentagon
Regular Polygons • A six-sided polygon. • The sum of the angles of a hexagon is 720 degrees. • Hexagon
Regular Polygons • A seven-sided polygon. • The sum of the angles of a hexagon is 900 degrees. • Heptagon
Regular Polygons • An eight-sided polygon. • The sum of the angles of an octagon is 1080 degrees. • Octagon
Regular Polygons • A ten-sided polygon. • The sum of the angles of a decagon is 1440 degrees. • Decagon
Regular Polygons A figure is convex if every line segment drawn between any two points inside the figure lies entirely inside the figure. • Convex
Math VocabularyUnit 5 2 Geometry By Jim Auld
Investigation 2 The perimeter of a polygon is the distance around the outside of the polygon • Perimeter L + L + W + W = P
Investigation 2 The number of square units it takes to completely fill a polygon. • Area 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.