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Tangents and Circles - YourTeacher.com - Geometry Help
By yourteachermathhelp
Students learn the following theorems related to tangents. If a line is tangent to a circle, then the line is perpendicular to the radius at the point of tangency. If a line is perpendicular to a radius at its outer endpoint, then the line is tangent to the circle. If two tangent segments are drawn to a circle from an external point, then the tangent segments are congruent. Students are then asked to use these theorems to find missing segment lengths and missing angle measures in given figures. Students also learn the definitions of common internal tangents and common external tangents.
Tangent Lines to a Circle Example Problems
By Mathispower4u
This video provides the definition of a tangent line
Segments of Secants and Tangents Theorem
By Jessie Mason
The segments of a secant segment and a tangent segment which share an endpoint outside of the circle. The product of the lengths of the secant segment and its external segment equals the square of the length of the tangent segment.
Example with tangent and radius | Circles | Geometry | Khan Academy
By Khan Academy
Example with tangent and radius | Circles | Geometry | Khan Academy
Calculating a side using tangent ratio
By Mr Jamieson Maths
This is an 'in classroom' video showing how to calculate a side length on a right triangle using the tangent ratio.
Derivative as slope of a tangent line | Taking derivatives | Differential Calculus
By Khan Academy
Calculus-Derivative: Understanding that the derivative is just the slope of a curve at a point (or the slope of the tangent line). All Khan Academy content is available for free at www.khanacademy.org
CA Geometry: Circle area chords tangent | Worked examples | Geometry | Khan Academy
By Khan Academy
71-75, area, chords, tangents of circles. All Khan Academy content is available for free at www.khanacademy.org
10.6 More Angle-Arc Theorems (Practice)
By AutenMath
A lesson on 1.) the relationship of inscribed and tangent-chord angles with the same or congruent arcs 2.) the measure of an inscribed angle whose intercepted arc is a semicircle and 3.) the relationship of tangent-tangent angles and their minor arcs
Example: Calculator to evaluate inverse trig function | Trigonometry | Khan Academy
By Khan Academy
Example using calculator to evaluate inverse tangent function
Symmetry and periodicity of trigonometric functions
By Khan Academy
Sal solves a problem by considering the periodicity of the tangent function.
Symmetry and periodicity of trigonometric functions
By Khan Academy
Sal solves a problem by considering the periodicity of the tangent function.
Central, inscribed, and circumscribed angles
By Khan Academy
Sal finds a missing length using the property that tangents are perpendicular to the radius.
Central, inscribed, and circumscribed angles
By Khan Academy
Sal finds missing angles using the property that tangents are perpendicular to the radius.
Central, inscribed, and circumscribed angles
By Khan Academy
Sal finds a missing angle using the property that tangents are perpendicular to the radius.
06 - Review of Essential Trigonometry (Sin, Cos, Tangent - Trig Identities & Functions)
By Math and Science
Quality Math And Science Videos that feature step-by-step example problems!