Решение:
Сторона:
b = x + r = x + 5
c = x + (a - r) = x + (18 - 5) = x + 13
182 + (x + 5)2 = (x + 13)2
324 + x2 + 10x + 25 = x2 + 26x + 169
10x - 26x = 169 - 25 - 324
b = x + 5 = 11.25 + 5 = 16.25
c = x + 13 = 11.25 + 13 = 24.25
Угол:
α° = arcsin
= arcsin
= 47.92°
Угол:
β° = arcsin
= arcsin
= 42.08°
Высота :
h =
=
= 12.06
Площадь:
S =
=
= 146.25
Радиус описанной окружности:
R =
=
= 12.13
Периметр:
P = a+b+c
= 18+16.25+24.25
= 58.5