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Level 102

Special Triangles


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ray
Part of a line that has one end point and goes in one direction without end.
line segment
Part of a line with two end points.
Intersecting lines
Two or more lines that meet at a common point.
Angle
Two rays with the same end point.
vertex
The point where two sides meet. (Shared end points of the line segments of a polygon.)
Acute Angle
An angle that measures LESS than 90 degrees.
Obtuse Angle
An angle that measures MORE than 90 degrees
right angle
An angle that is 90 degrees (It makes a square in the corner).
straight angle
An angle that measures 180 degrees
Adjacent Angles
Angles that are next to each other. They share a vertex and a common side.
Vertical Angles
Angles opposite one another when two lines intersect.
Congruent
A plane figure with the same size and shape.
Complementary Angles
The sum of the measure of two angles is 90 degrees.
Supplementary Angles
The sum of the measure of two angles is 180 degrees.
Scalene Triangle
A triangle with no congruent sides
isosceles triangle
Triangle with 2 equal sides and 2 equal angles.
equilateral triangle
Triangle with a 90° angle
Right Triangle
A triangle with one right angle.
acute triangle
A triangle with three acute angles.
obtuse triangle
A triangle with one obtuse angle.
Horizontal
Straight line across from side to side (length)
vertical line
Straight up and down line (height)
area
the surface; Length x Width
perimeter
The distance around a geometric figure.
volume
measures the amount of space taken up by the object.
coordinate plane
A plan formed by the intersection of a horizontal number line called the x-axis and a vertical number line called the y-axis.
ordered pair
A pair of numbers that can be used to locate a point on a coordinate plane.
1/2
sin (30°)
√2/2
sin (45°)
√3/2
sin (60°)
√3/2
cos (30°)
√2/2
cos (45°)
1/2
cos (60°)
1/√3
tan (30°)
1
tan (45°)
√3
tan (60°)
1/2
sin (π/6)
√2/2
sin (π/4)
√3/2
sin (π/3)
√3/2
cos (π/6)
√2/2
cos (π/4)
1/2
cos (π/3)
1/√3
tan (π/6)
1
tan (π/4)
√3
tan (π/3)