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  2. Tangent of a Circle | Definition, Formula & Examples

    study.com/academy/lesson/tangent-of-a-circle.html

    The Tangent-Radius Theorem states that a line that is tangent to a circle will always be perpendicular to the radius of the circle drawn from the point of tangency. For instance, the figure below ...

  3. Slopes of a Line | Graphs, Formula & Examples - Lesson -...

    study.com/academy/lesson/slopes-and-tangents-on-a-graph.html

    The orange line represents the original function on the graph, and the purple dotted line is the tangent line. Since it is a horizontal line, the slope at the point {eq}(1, 2) {/eq} is {eq}0 {/eq ...

  4. Tangent Line | Definition, Equation & Examples - Study.com

    study.com/academy/lesson/tangent-line-definition-equation.html

    This section will show concretely how to find the tangent line to a given function at a particular point. Example 1: Find the equation of the tangent line to the curve {eq}f(x) = x^2 {/eq} at the ...

  5. How to Find the Tangent Line to a Curve at a Given Point

    study.com/skill/learn/how-to-find-the-tangent-line-to-a-curve-at-a-given-point...

    Step 3: Use the point-slope formula of a line to substitute the values calculated in steps 1 and 2. This will yield the equation of the tangent line to the function {eq}f(x){/eq} at the given ...

  6. Tangent Line of a Function | Definition, Properties & Examples

    study.com/academy/lesson/tangents-definition-properties-quiz.html

    The formula for finding the tangent line of a curve at a given point is the point-slope form of an equation of a line with the derivative evaluated at the point as the slope. Tangents Topics ...

  7. Tangent Plane to a Surface | Equation & Steps - Lesson -...

    study.com/academy/lesson/tangent-plane-to-the-surface.html

    The formula to find the tangent plane is Fx(x-x0)+Fy(y-y0)+Fz(z-z0) where x0, y0, z0 are a point on the tangent plane and Fx, Fy, Fz are the partial derivates of F with respect to x, y and z of ...

  8. Normal Line to a Curve | Equation & Examples - Lesson - Study.com

    study.com/academy/lesson/finding-the-normal-line-to-a-curve-definition...

    The normal line equation, or normal line formula, is the line that is perpendicular to the tangent line and that passes through the tangency point. Fig. 2 shows the steps to get to the equation of ...

  9. Secant Line | Definition & Examples - Lesson - Study.com

    study.com/academy/lesson/secant-line-definition-formula.html

    Secant Line vs. Tangent Line As stated above, a secant line passes through two or more points on a curve. On the other hand, a tangent line is a line that touches a curve at only one point.

  10. Common Tangent Overview & Examples - Lesson - Study.com

    study.com/academy/lesson/common-tangent-definition-construction.html

    An external common tangent is a common tangent that does not pass through line d. Tangent Definition in Geometry In geometry, a tangent is a line that touches a curve at exactly one point.

  11. Linear Approximation | Formula, Derivation & Examples

    study.com/academy/lesson/linear-approximation-in-calculus-formula-examples.html

    The tangent line is useful because, as shown in the earlier example, every curve looks like a straight line when zoomed in at a particular point. So, the tangent line is a good estimate, or a ...