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Trig. Lesson 1.1-1.3
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Gravity
1.1 (Angles, degrees, special triangles.) 1.2 (the rectangular coordinate system.) 1.3 (x,y,r; definitions of triangular functions)
Terms in this set (25)
Angle
A figure formed by two rays with a common endpoint
Vertex
The common endpoint of an angle
Positive angles
Counter clockwise rotation
Negative angles
Clockwise rotation
Right angle
an angle that measures 90 degrees
Straight angle
an angle that measures 180 degrees
acute angle
an angle that measures less than 90 degrees
Obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
complementary angles
Two angles whose sum is 90 degrees
supplementary angles
Two angles whose sum is 180 degrees
All angles of a triangle add up to be....
180 degrees
Hypotenuse
The side opposite the right angle in a right triangle; the longest side of a triangle.
Pythagorean Theorem
a²+b²=c²
Special Triangles
30-60-90
45-45-90
Distance formula
standard position
An angle with initial side on the positive x-axis and vertex at the origin.
r=the square root of x squared plus y squared
Distance from the origin to any point (x,y)
quadrantal angle
Angle is standard position with terminal side along an axis.
Coterminal angles
Both angles in standard position with same terminal side but different amounts of rotation.
Sin
y/r
Cos
x/r
Tan
y/x
csc
r/y
Sec
r/x
Cot
x/y
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