Geometry Guide
- 1. Geometry For Dummies Dustin Gavcus Lines Angles Triangles Quadrilaterals Circles
- 2. Lines Lines Segments Rays Intersecting Perpendicular Parallel Skew
- 3. Line A never ending straight line
- 4. Line Segments A line that starts at one point and ends at another.
- 5. Rays A ray is a line that starts at one point and keeps on going forever.
- 6. Intersecting Lines Intersecting lines are two lines that cross at a part
- 7. Perpendicular Lines Perpendicular lines are lines that go across like a capital T.
- 8. Parallel Lines Parallel lines are two lines that never cross each other.
- 9. Skew Line A skew line is a line that is not on the same plain.
- 10. Angles Acute Obtuse Right Straight Vertex/Vertices Complementary Supplementary Vertical Opposite Adjacent
- 11. Acute Angles An acute angle is an angle that is always lower than 90 degrees.
- 12. Obtuse Angles An obtuse angle is an angle always is over 90 degrees.
- 13. Right Angle A right angle is an angle that, no matter what, has to be 90 degrees.
- 14. Straight Angle In a line or direction that is not curved or bent.
- 15. Vertex/Vertices The point where two lines meet to form an angle, especially the point of a triangle.
- 16. Complementary Two angles that are complementary add up to 90 degrees.
- 17. Supplementary In addition to what already exists.
- 18. Vertical A pair of opposite congruent angles formed where two lines intersect.
- 19. Opposite Two numbers that are an equal distance from zero on the number line. Zero
- 20. Adjacent Angles that are side by side and have a common vertex and ray.
- 21. Triangles Right Obtuse Acute Scalene Isosceles Equilateral Sum of internal angles Perimeter Area of a triangle
- 22. Right Triangle A right triangle is a triangle that has one side that is 90 degrees.
- 23. Obtuse Triangle An obtuse triangle is a triangle that has one obtuse angle.
- 24. Acute Triangle An acute triangle is a triangle with all of the sides being acute angle sides.
- 25. Scalene Triangle A scalene triangle is a triangle that has no equal sides.
- 26. Isosceles Triangle An isosceles triangle is a triangle that only has two equal sides.
- 27. Equilateral Triangle An equilateral triangle is a triangle that has every side equal.
- 28. Sum of Internal Angles All of the angles inside of a shape.
- 29. Perimeter The perimeter is the whole length of the border around an area or shape.
- 30. Area of a Triangle The area of a triangle always has to equal 180 degrees. Triangles
- 31. Quadrilaterals Quadrilateral Trapezoid Parallelogram Rectangle Rhombus Square Area of a Rectangle Area of a square Area of a Parallelogram Area of a trapezoid Perimeter of a Rectangle Perimeter of a square
- 32. Quadrilateral A quadrilateral is any shape with exactly 4 sides.
- 33. Trapezoid A trapezoid is a quadrilateral with only 1 side being parallel.
- 34. Parallelogram A parallelogram is a shape that has 2 parallel sides.
- 35. Rectangle A rectangle is a quadrilateral that has 2 equal sides, 4 right angles, and 2 parallel sides.
- 36. Rhombus A rhombus is a quadrilateral that has 2 parallel sides, no right angles, and 2 equal sides.
- 37. Square A square is a quadrilateral that has 4 equal sides, 4 right angles, and 2 parallel sides.
- 38. Area of a Rectangle The area of a rectangle is length x width.
- 39. Area of a Square Pretty much the same thing as the area of a rectangle. Length x Width.
- 40. Area of a Parallelogram The area of a parallelogram is the area inside a parallelogram.
- 41. Area of a Trapezoid The area of a trapezoid is the inside around a trapezoid.
- 42. Perimeter of a Rectangle The perimeter of a rectangle is the outside of a rectangle.