Odpowiedzi

2010-02-04T18:21:21+01:00
A = 12
b = 5
c2 = a2 + b2
c = √144 +25 = √169 = 13

P = 1/2 * a*b
P = 1/2 * 12 * 5 = 6*5 = 30

r = 2P/a+b+c

r = 2*30/12+5+13
r = 60/30
r = 2
1 5 1