• #### Calculating Coordinates in the Unit Circle - Problem 1

##### Math›Geometry›Pythagorean Theorem
How to find the coordinates on the unit circle, given an angle of 225 degrees.
• #### Calculating Coordinates in the Unit Circle - Problem 1

##### Math›Trigonometry›Pythagorean Theorem
How to find the coordinates on the unit circle, given an angle of 225 degrees.
• #### Similar Triangles in Circles and Right Triangles - Problem 2

##### Math›Geometry›Similarity
How to find missing side lengths in a right triangle with an altitude drawn from the right angle.
• #### Calculating Coordinates in the Unit Circle - Problem 2

##### Math›Geometry›Pythagorean Theorem
How to find the coordinates on the unit circle, given an angle of 60 degrees.
• #### Calculating Coordinates in the Unit Circle - Problem 2

##### Math›Trigonometry›Pythagorean Theorem
How to find the coordinates on the unit circle, given an angle of 60 degrees.
• #### Arc Length - Problem 2

##### Math›Geometry›Circles
How to find the radius of a circle given arc length and arc measure.
• #### Families of Polar Curves: Circles, Cardiods, and Limacon - Concept

##### Math›Precalculus›Polar Coordinates and Complex Numbers
How to graph the special cases of the family r = a + b cos (theta) when a or b = 0.
• #### Radii to Tangents - Problem 1

##### Math›Geometry›Circles
How to calculate the central angle formed by radii to tangents that intersect at a point outside the circle.
• #### Radii to Tangents - Problem 2

##### Math›Geometry›Circles
How to calculate the measure of a missing angle in a quadrilateral formed by two circles that are tangent but not congruent and their radii drawn to a common line of tangency.
• #### Parametrizing a Circle - Problem 1

##### Math›Precalculus›Vectors and Parametric Equations
How to find parametric equations of a semicircle centered at (0,0) with radius 12, oriented counter-clockwise.
• #### Circumference - Concept

##### Math›Geometry›Circles
How to calculate the circumference of a circle.
• #### Circumference - Problem 2

##### Math›Geometry›Circles
How to find the radius of a circle given circumference.
• #### Secants - Concept

##### Math›Geometry›Circles
How to define a secant; how to find the length of various secants in circles.
• #### Radii to Tangents - Concept

##### Math›Geometry›Circles
How to define a tangent line; how to determine the angle a radius to a tangent forms.
• #### Circumference - Problem 4

##### Math›Geometry›Circles
How to find the circumference of a figure formed by two different circles and a straight line.
• #### Circumference - Problem 1

##### Math›Geometry›Circles
How to calculate the circumference of a circle given diameter or radius.
• #### Families of Polar Curves: Circles, Cardiods, and Limacon - Problem 2

##### Math›Precalculus›Polar Coordinates and Complex Numbers
How to graph members of the polar family r = a + b cos (theta) when a > b > 0.
• #### Families of Polar Curves: Circles, Cardiods, and Limacon - Problem 3

##### Math›Precalculus›Polar Coordinates and Complex Numbers
How to graph members of the polar family r = a + b*cos(theta) when 0 < a < b.
• #### Arc Length - Problem 1

##### Math›Geometry›Circles
How to find the length of an arc given a radius and arc length.
• #### Arc Length - Concept

##### Math›Geometry›Circles
How to define arc length and how it is different from arc measure; how to calculate the length of an arc.