рочро *Fill in: had, didn t have, was, weren t, were. - id42355354 от onkyyyyyyy 01.03.2020 07:39

Question

Геометрия: рочро *Fill in: had, didn t have, was, weren t, were. rugin ang urug There 1) wide streets in the ancient city of Athens. In fact, the streets 2) narrow. The city 3) department stores, but it 4) a large Agora, or marketplace. There 5) a great theatre. Most buildings 6) running water, but the city 7) public fountains where people could get their water.​

onkyyyyyyy · Accepted Answer

находим координаты векторов.

св = (-2; -2; -9) |cb| = √(4 + 4 + 81) = √89.

сд = (-11; -7; 1) |cд| = √(121 + 49 + 1) = √171.

векторное произведение двух векторов a = {ax; ay; az} и b = {bx; by; bz} в декартовой системе координат - это вектор, значение которого можно вычислить, используя следующую формулу:

a × b = {aybz - azby; azbx - axbz; axby - aybx}.

подставив значения, получим:

-2 - 63 99 - (-2) 14 - 22

-65 101 -8 .

модуль abхcd = √)² + 101² + (-8)²) = √14490 = 3√1610 ≈ 120,3744.

площадь равна (1/2)*3√1610 = (3/2)√1610 ≈ 60,1872 .