Now looking at this vector visually, do you see how we can use the slope of the line of the vector from the initial point to the terminal point to get the direction of the vector? Here is all this visually.

It emerges from a more general formula: Yowza -- we're relating an imaginary exponent to sine and cosine! And somehow plugging in pi gives -1? Could this ever be intuitive? Not according to s mathematician Benjamin Peirce: It is absolutely paradoxical; we cannot understand it, and we don't know what it means, but we have proved it, and therefore we know it must be the truth.

Argh, this attitude makes my blood boil!

Formulas are not magical spells to be memorized: Euler's formula describes two equivalent ways to move in a circle. This stunning equation is about spinning around? Yes -- and we can understand it by building on a few analogies: Starting at the number 1, see multiplication as a transformation that changes the number: If they can't think it through, Euler's formula is still a magic spell to them.

While writing, I thought a companion video might help explain the ideas more clearly: It follows the post; watch together, or at your leisure. Euler's formula is the latter: If we examine circular motion using trig, and travel x radians: The analogy "complex numbers are 2-dimensional" helps us interpret a single complex number as a position on a circle.

Now let's figure out how the e side of the equation accomplishes it. What is Imaginary Growth? Combining x- and y- coordinates into a complex number is tricky, but manageable.

But what does an imaginary exponent mean? Let's step back a bit.Radius The radius of a circle is the length of a line segment from its center to its perimeter.

The standard form for the equation oif a circle is (x-a) 2 +(y-b) Write the equation for a circle with center at(9,8) and a diameter of 16;. Writing equations in standard form is easy with these examples! From the equation, (x +1)2 +(y −3)2 =3, the center is (-1, 3), and the radius is 3.

Practice Exercises Find the equation of a circle. 1. Center (-1, -4); radius 8 2. Endpoints of a diameter are P (-1, 3) and Q (7, -5) Given the equation of a circle, find the center and radius for each. 3. x2 +y2 −2x −2y =2 4. x2 +y2 +6y +2 =0 Answers: 1.

And that is the "Standard Form" for the equation of a circle! It shows all the important information at a glance: the center (a,b) and the radius r. Use the information provided to write the equation of each circle. 9) Center: (13, (−13, −16) Point on Circle: (−10, −16) 11) Ends of a diameter: (18, −13) and (4, −3) 12) Center: (10, −14) Tangent to x = 13 13) Center lies in the first quadrant Tangent to x = 8, y = 3, and x = 14 Equations of Circles.

Equation Standard Form. The standard form for the equation oif a circle is (x-a) 2 + Write the equation for a circle with center at(,) and a diameter of 23; Write the equation for a circle with center at(-4,11) and a radius of 20; Subscribe to our mailing list. Email Address.

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Introduction to Vectors – She Loves Math