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education/math/Standard forms of circles.md
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For $(f\circ g)(x)$ for two sets, you look for $x$ from $f$ and an equivalent $y$ value from $g$, and leftover coordinates are the answer. The order of $f$ and $g$ does matter. For $(f\circ g)(x)$ for two sets, you look for $x$ from $f$ and an equivalent $y$ value from $g$, and leftover coordinates are the answer. The order of $f$ and $g$ does matter.
# Formulae # Formulae
The general equation for a circle: The general equation for a circle:
$$ (x - h)^2 + (y - k)^2 =r $$ $$ (x - h)^2 + (y - k)^2 =r^2 $$
Distance formula: Distance formula:
$$ \sqrt{(x_2-x_1)^2 + (y_2-y_1)^2} $$ $$ \sqrt{(x_2-x_1)^2 + (y_2-y_1)^2} $$
Midpoint foruma: Midpoint foruma: