$S=\frac{\pi a^2\sqrt{2}}{2};\ V=\frac{\pi a^3\sqrt{2}}{4}$

$S=\frac{\left(1+\sqrt{2}\right)\pi a^2}{2};\ V=\frac{\pi a^3\sqrt{2}}{4}$

$S=\frac{\left(1+\sqrt{2}\right)\pi a^2}{2};\ V=\frac{\pi a^3\sqrt{2}}{12}$

$S=\frac{\pi a^2\sqrt{2}}{2};\ V=\frac{\pi a^3\sqrt{2}}{12}$

$\frac{SO.OH}{\sqrt{SO^2+OH}}$

$\frac{SO.OH}{\sqrt{SO^2-OH^2}}$

$\frac{SO+OH}{\sqrt{SO^2+OH^2}}$

$\frac{SO.OH}{\sqrt{SO^2+OH^2}}$

$R=\frac{CẠNH\ \sqrt{3}\ }{3}$

$R=\frac{abc}{4S}$

$R=\frac{cạnh\ huyền\ }{2}$

$R=\frac{đường\ chéo}{2}$

$2\left(\sqrt{3}+1\right)\pi R^2\ \ \ and\ \ \ \ \ 2\sqrt{3}\pi R^3$

$2\sqrt{3}\pi R^2\ \ \ and\ \ \ 2\left(\sqrt{3}+1\right)\pi R^2$

$2\sqrt{3}\pi R^2\ \ and\ \ \ 2\pi R^2$

$2\sqrt{3}\pi R^2\ \ \ and\ \ \ 2\sqrt{3}\pi R^2+R^2$

$\frac{240}{\pi}$

$\frac{120}{2\pi}$

$50$

$\frac{120}{\pi}$

$R=\frac{R_n\sqrt{3}}{3}$

$R=\frac{l^2}{2h}$

$R=\frac{R_n}{2}$

$R=\frac{2R_n\sqrt{3}}{3}$

$R=\sqrt{\left(\frac{h}{2}\right)^2+R_đ^2}$

$R=\sqrt{R_{mb}^2+R_đ^2-\frac{\left(giao\ tuyến\ \right)^2}{4}}$

$R=R_{mb}^2+R_đ^2-\frac{\left(giao\ tuyến\ \right)^2}{4}$

$R^2=\left(\frac{h}{2}\right)^2-R_đ^2$

$8$

$7$

$9$

$3$

1992

2000

1998

1996