Определение параметров правильного многоугольника по радиусам вписанной и описанной окружности

Калькулятор по формулам вычисляет число сторон и длину одной стороны многоугольника, но при условии, если задан радиус описанной и вписанной окружности данного правильного многоугольника.
Данный калькулятор считает число сторон и округляет его до ближайшего целого, а уже потом, исходя из этих данных, высчитывает длину стороны и делает обратный расчет одного из радиусов. То есть калькулятор сам себя проверяет на правильность расчетов.



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Определение параметров правильного многоугольника по радиусам вписанной и описанной окружности
 Число сторон, точно:
 Число сторон, округленно:
 Радиус вписанной окружности (для округленного числа сторон):
 Длина стороны (для округленного числа сторон):