Digital SAT Math Practice Question #1309
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Radius squared formula: $r^2 = (d/2)^2 + (e/2)^2 - f = (4)^2 + (-5)^2 - (-8) = 16 + 25 - (-8) = 49$. Area is immediately $49\pi$.
Complete the square for both $x$ and $y$: $(x^2 - 8x + 16) + (y^2 + 10y + 25) = 8 + 16 + 25$ $(x - (4))^2 + (y - (-5))^2 = 49$. The radius squared is $r^2 = 49$. The area of a circle is $A = \pi r^2 = 49\pi$....
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