Khan Academy:
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Pythagorean Theorem and Radii of Circles (5:52)Finds missing segments of triangles within a circle using the Pythagorean Theorem.
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Features of a circle from its equation in standard form (3:50)
Finding the center and radius of a circle from the equation in standard form. Given $(x+3)^2 + (y-4)^2 = 49$, find the center and radius. Solution: center is $(-3,4)$ and radius is $7$. -
Features of a circle from its equation in standard form.
Find the center and radius of.
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Features of a circle from its expanded equation (4:20)Graph the circle
(Puts the equation into standard form by completing the square.)
Features of a circle from its expanded equation.Find the center and radius of the circle
PatrickJMT: