Question

ПОМОГИТЕ! найти площадь боковой поверхности и объем цилиндра

Answer 1

$displaystyle CD = frac{OE}{sin60} = frac{30}{frac{sqrt{3}}{2}} = frac{60}{sqrt3}\ OE = r = frac{CD}{2} = frac{30}{sqrt3}\ OO_1 = h = frac{OE}{sin30} = frac{30}{sqrt3}cdot 2= frac{60}{sqrt3}\ S = 2pi rh = 2picdotfrac{30}{sqrt3}cdotfrac{60}{sqrt3} = 1200pi\ V = pi r^2h = pi cdotfrac{900}{3}cdotfrac{60}{sqrt3} = 18000frac{pi}{sqrt3}$