Question

помогите решить срочно

Answer 1

1)r=S/p
p=4+5+7/2=27/2
S=√70(27/2-4)(27/2-5)(27/2-7)=191.6
r=191.6*2/27=14.1
2)R=abc/4S=4*5*7/4*191.6=0.18