# Math Plane Geometry

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 Author: Rayna ID: 267258 Filename: Math Plane Geometry Updated: 2014-09-18 13:51:28 Tags: Math Folders: Math Description: Geometry terms, 7th grade Math Abeka Show Answers:

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1. :represented by a dot
point
2. :a group of points having to endpoints
line segment
3. :describes segments or angles of the same length, shape or size
congruent  ≃
4. :a group of points having no endpoints
line

(A line extends indefinitely in two opposite directions.)
5. :a group of points having one endpoint
ray

(A ray extends indefinitely in one direction.)
6. :two rays that share a common endpoint
angle
7. : a common endpoint where two rays or sides of a polygon meet, usually labled with capital letters
vertex
8. : a 90 degree angle with a square corner
right angle
9. :lines that cross each other at some point
intersecting lines
10. :intersecting lines that form four right angles
perpendicular lines
11. :lines that never intersect
parallel lines
12. :does not have a point of intersection
simple closed shape
13. symbol :have the same shape but not the same size
similar shapes  ˜
14. :simple closed shape made up of line segments
polygon
15. :a three sided polygon
triangle
16. :a four-sided polygon
17. :a quadrilateral having opposite sides that are parallel
parallelogram
18. : a parallelogram having four right angles
rectangle
19. : a rectangle having four congruent sides
square
20. : a parallelogram having four congruent sides
rhombus
21. :a quadrilateral having only one set of opposite sides that are parallel
trapezoid
22. :a five sided polygon
pentagon
23. :a six-sided polygon
hexagon
24. :a seven-sided polygon
heptagon
25. :an eight-sided polygon
octagon
26. Formula Perimeter Rectangle/parallelogram
P = 2l + 2w
27. Formula Perimeter square
P = 4s
28. Formula Perimeter Triangle
P = a + b + c
29. Formula Area Rectangle
A = bh
30. 1 square foot (sq. ft.) =        sq. in.
144 sq. in.
31. 1 acre (a.) =      sq. ft.
43,560 sq. ft.
32. 1 square Yard (sq. yd.) =     sq. ft.
9 sq. ft.
33. 1 square mile (sq. mi.) =     acres
640 acres
34. Area Square
A = s2
35. Area of Parallelogram
A = bh
36. Area of Triangle
• A = b h
•        2
• 1/2 x base x height
37. Area of Trapezoid
• A = H(b1+b2)
•           2
38. Right Angle
900

39. Formula sides of right triangle
40. Acute Angle
Less than 90o
41. Angle that measures more than 90o
obtuse angle
42. angle that measures 180o
straight angle
43. triangle that has two congruent sides and two congruent angles
isosceles triangle
44. triangle that has three congruent sides and angles
equilateral triangle
45. Name of an instrument that is used to measure the number of degrees in an angle.
protractor
46. Half of a circle is called a?
How many degrees is it?
• semicircle
• 180o
47. The line segment that goes through the center of a circle and has both endpoints on the circle?
diameter
48. The length of a straight line drawn from the center to a point on a circle?
49. Degrees in a circle?
360o
50. Formulas for circumference of a circle?

distance around a circle
51.  =
• 3.14
• 3 1/7
52. Formula for area of a circle?
53. Formula area of regular polygon

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