<span>разуют арифметическую прогрессию. Найдите длину высоты треугольника, проведенной из вершины А, если известно, что АС= 1 см.</span>
<span><span><span><span><span><span>A</span><span>B</span><span>=</span><span>A</span><span>C</span><span>c</span><span>o</span><span>s</span><span><span><span><span>30</span></span><span><span>0</span></span></span></span><span>=</span><span><span><span><span><span>3</span></span></span><span><span>√</span></span></span></span><span><span><span>/</span></span></span><span>2</span><span>,</span><span>B</span><span>C</span><span>=</span><span>A</span><span>C</span><span>s</span><span>i</span><span>n</span><span><span><span><span>30</span></span><span><span>0</span></span></span></span><span>=</span><span>1</span><span><span><span>/</span></span></span><span>2</span><span>,</span><span>B</span><span>D</span><span>=</span><span><span><span><span><span>A</span><span>B</span><span>⋅</span><span>B</span><span>C</span></span></span><span><span><span>A</span><span>C</span></span></span></span></span><span>=</span><span><span><span><span><span>3</span></span></span><span><span>√</span></span></span></span><span><span><span>/</span></span></span><span>4</span></span></span></span></span></span>
Ответ:
224
Пошаговое объяснение:
х - задуманное число
х/2 - х/8 = 84
4х/8 - х/8 = 84
4х - х = 84 * 8
3х = 672
х = 672:3
х = 224