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Geometry Vocabulary and Concepts Overview

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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Geometry Vocabulary and Concepts Overview

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  1. Math VocabularyUnit 5 1 Geometry By Jim Auld

  2. Angles • Right 90°

  3. Angles • Acute An angle measuring less than 90°

  4. Angles • Obtuse An angle measuring more than 90° and less than 180°

  5. TrianglesThe Sum of all the angles = 180° • Equilateral Triangle A triangle with 3 congruent sides

  6. TrianglesThe Sum of all the angles = 180° • Scalene Triangle A triangle with NO congruent sides

  7. TrianglesThe Sum of all the angles = 180° • Isosceles Triangle A triangle with two congruent sides

  8. TrianglesThe Sum of all the angles = 180° • Right Triangle A triangle with one right angle (90°)

  9. QuadrilateralsThe Sum of all the angles = 360° A four-sided polygon

  10. Quadrilaterals The Sum of all the angles = 360° • Parallel Two Lines that never intersect

  11. Quadrilaterals The Sum of all the angles = 360° • Rectangle • 2 parallel sides • 4 Right Angles

  12. Quadrilaterals The Sum of all the angles = 360° • Square • 2 Parallel sides • 4 Right Angles • 4 Equal sides

  13. Quadrilaterals The Sum of all the angles = 360° • A parallelogram whose four sides are congruent and whose opposite angles are congruent • Rhombus

  14. Quadrilaterals The Sum of all the angles = 360° • A quadrilateral with exactly one pair of parallel sides • Trapezoid

  15. Quadrilaterals • A quadrilateral with opposite sides are parallel and congruent • Parallelogram

  16. Regular Polygons A polygon with all sides and all angles equal

  17. Regular Polygons • A five-sided polygon. • The sum of the angles of a pentagon is 540 degrees. • Pentagon

  18. Regular Polygons • A six-sided polygon. • The sum of the angles of a hexagon is 720 degrees. • Hexagon

  19. Regular Polygons • A seven-sided polygon. • The sum of the angles of a hexagon is 900 degrees. • Heptagon

  20. Regular Polygons • An eight-sided polygon. • The sum of the angles of an octagon is 1080 degrees. • Octagon

  21. Regular Polygons • A ten-sided polygon. • The sum of the angles of a decagon is 1440 degrees. • Decagon

  22. Regular Polygons A figure is convex if every line segment drawn between any two points inside the figure lies entirely inside the figure. • Convex

  23. Math VocabularyUnit 5 2 Geometry By Jim Auld

  24. Investigation 2 The perimeter of a polygon is the distance around the outside of the polygon • Perimeter L + L + W + W = P

  25. Investigation 2 The number of square units it takes to completely fill a polygon. • Area L x W = A

  26. Investigation 2 • Dimension The measurement of a polygon. Example: Length, Width or Height.

  27. Investigation 2 • Similar Polygons that have the same shape, not necessarily the same size they are similar.

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