Question

Знайти радіус кола. Найдите радиус окружности.​

Answer 1

AE⊥BC

AE=BE=2, EC=4

AC=√(4+16)=2√5

EF/FC =AE/CD =2/3

FC =3/5 EC =12/5

FD =√(144/25 +9) =3√41/5

sinD =FC/FD =12/3√41

R(ADC) =AC/2sinD =2√5/2 :12/3√41 =√205/4