Geometry
Formed by two rays sharing a common vertex when one ray rotates away from the other ray the distance of a given span
Angle
A triangle with one right angle
Right Triangle
Exactly two angles that have a sum of 180º
Supplementary angles
what's the rule
3, 6, 12, 24
x2
345 divided by 6
57 r 3
An angle that is less than a right angle
Acute angle
A triangle with three acute angles
Acute triangle
A tool to measure an angle in degrees
protractor
what's the rule
5,10,15,20,25
+5
347 divided 4
85 r 1
Lines that meet or cross each other
intersecting lines
An angle that is equal to 180º, also known as a line
straight angle
A standard unit used to measure angles
degree
What is the rule
50, 40, 30, 20, 10, 0
-10
What is the area of a rectangular garden with a width of 45 and length of 32
1,440
A part of a line that consists of two endpoints and contains every point of the line between them
line segment
An angle that forms a square corner (90 degrees)
Right Angle
A polygon with four sides, four vertices, and four angles
Quadrilaterals
4x6
24
Round 3,897 to the nearest 100
3,900
An angle that measures greater than 90º but less than 180º
an obtuse angle
A part of a line that has one end point and goes on indefinitely in the other direction
ray
Lines that are always the same distance apart and will never intersect
parallel lines
A special type of intersecting line wherein a right angle is formed at the point of intersection.
perpendicular lines
20-4.76
15.24