25 The equation of a circle is $x^2 + y^2 = 9$ Work out the length of the diameter. Circle your answer. [1 mark] 3 6 9 18
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The equation of a circle in standard form is (x - h)^2 + (y - k)^2 = r^2, where (h, k) is the center of the circle and r is the radius. In this case, the equation is already in standard form: x^2 + y^2 = 6. Show more…
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