Question

Find the diameter of circle whose circumfrence is 66cm
​

Answer 1

$\huge \underline{ \underline{ \bf \purple{Solution :}}}$

Circumference of circle = 2πr = 66 cm

→ 2 × 22/7 × r = 66

→ r = ( 66 × 7 ) / 44

→ r = 10.5 cm

Radius of circle = 10.5 cm

Diameter of circle = 21 cm

Answer 2

Step-by-step explanation:

Solution:

\begin{gathered}\implies \sf D = {b}^{2} - 4ac \\ \\\implies \sf D = { ( - 4)}^{2} - 4 \times 3 \sqrt{3} \times ( - \sqrt{3} ) \\ \\\implies \sf D = 16 + 12 \sqrt{9} \\ \\\implies \sf D = 16 + 36 \\ \\ \implies \boxed{ \sf D = 52}\end{gathered}

⟹D=b

2

−4ac

⟹D=(−4)

2

−4×3

3

×(−

3

)

⟹D=16+12

9

⟹D=16+36

⟹

D=52