94,2: 3,14=30см -диаметр круга 30: 2=15см -радиус круга 15*15*3,14=706,5см²-площадь круга
Nikita
27.03.2021
School uniforms can be different. someone who likes to loose, someone loves strict . but the classical school uniforms for me still remains white top black bottom . certainly convenient to walk to school in the free form and mood rises , but then everyone would go to school as the street, and generally will not discipline . in my opinion school uniform should be comfortable, but at the same time practical beautiful. not necessarily, that would be all the same as one walked . it is important that at least the tone of all forms was the same . indeed, often it happens that someone shape black , gray someone , and someone even blue . it would be good if there were a choice between sundresses and skirts that you could choose to wear a vest , or simply blouse. and be sure to that would have introduced a day when students can come in free form . one day a week . for example , on saturday, in a short day , or monday , that would be preserved the atmosphere of relaxation . general school uniform should first like the student that would go to school with mood.
arbekova
27.03.2021
Так как треугольник равнобедренный,то радиус можно найти по формуле r=a^2/2h,где h-высота,проведенная к основанию, а-боковая сторона у вас известна,поэтому останется найти только этого проведем ее и рассмотрим получившийся мал. нем будет один угол 90(т.к. проведена высота), другой 30(т.к. углы при основании равны у большого треугол и против основания ,в равноб. угол в 120 теперь, против угла в 30 гр,в прямоугол треуг. лежит катет равн. половине гипот., а она равна 5,значит и высота равна 2.5. остается просто подставить все данные и посчитать радиус