Notes for Homework #8, due Tues., March 19

Notes on the law of sines and how it differs from the law of cosines.

Notes for Homework 6, due March 5

Notes for the double angle formulae and the addition and subtraction of angles

Notes on trig identities
 

Notes on Homework 5, due Feb. 27

Notes on inverse trig functions

Notes on decimal degrees, degrees-minutes-seconds (DMS), radians and radians given as multiples of pi

Notes for Homework 4, due Feb. 19

Notes for changing degrees to radians and vice versa



Notes for trig values for angles in Quadrants II, III and IV
 

Notes for Homework 3, due Feb. 12

Notes for finding all five other trig values at an angle, give sine or cosine or tangent

Notes on rationalizing denominators
 

Notes for Homework 2, due Mon. Feb 4

Notes for defining a triangle by three points in the plane. Finding the area and classifying the triangle by finding the distance of all three sides.

Dealing with "the famous angles": 0°, 30°, 45°, 60°, 90°. Finding secant, cosecant and cotangent of these angles.
 

Notes for homework #1, due Jan. 29

Notes on the triangle inequality

Classifying triangles defined by side lengths
Let the three sides be called a, b and c, where c is the longest side.

There are three possible relationships between the sum of the squares of a and b and the value c². 

a² + b² > c²   This means the triangle is acute.
a² + b² = c²   This means the triangle is right. This is the Pythagorean Theorem,
a² + b² < c²   This means the triangle is obtuse

Here are some practice problems
     

Given one angle measurement, create an isosceles triangle. If the angle is acute, there are two possible isosceles triangle.

Notes on Heron's Formula and practice problems