Question

СРОЧНО))))) ДАЮ 50 БАЛЛОВ!!!

Answer 1

$\displaystyle\\1) S_b=\pi R l$

SΔABC = 24 , S=1/2 a*h

24=1/2*a*3

48=3a

a=16=AC , тогда OC=1/2AC=1/2*16=8 см

C ΔBOC (∠BOC=90°) BC²=BO²+OC²

BC²=3²+8²=9+64=73

BC=√73

$\displaystyle\\S_b=\pi*8*\sqrt{73}=8\pi\sqrt{73}$

2)

$\displaystyle\\C=2\pi R\\\\4\pi=2\pi*R\\\\R=2\\\\\\V=\frac{4}{3}\pi R^3 =\frac{4}{3}\pi 2^3=\frac{4}{3}*8*\pi=\frac{32\pi}{3}$

3)

$\displaystyle\\p=\frac{10+26+24}{2}=30 \\\\S=\sqrt{p(p-a)(p-b)(p-c)}=\sqrt{30(30-10)(30-24)(30-26)}=\\\\\\=\sqrt{30*20*6*4}=\sqrt{14400}=120\\\\V=S_o*h=120*8=960$