Question
Find the equation of a circle with centre at origin and radius 3.
✓
Answer
Standard equation of a circle is
$
\therefore \begin{aligned}
x^2+y^2 & =r^2 \quad \text { here } r=3 \\
x^2+y^2 & =3^2 \\
x^2+y^2 & =9 \quad \text { is the equation of circle }
\end{aligned}
$
$
\therefore \begin{aligned}
x^2+y^2 & =r^2 \quad \text { here } r=3 \\
x^2+y^2 & =3^2 \\
x^2+y^2 & =9 \quad \text { is the equation of circle }
\end{aligned}
$
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\end{array}\right]_{2 \times 3} \text { Find } A+B \text {. }
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