P= √[p(p-a)(p-b)(p-c)]
p= ½(a+b+c) a=12 b=14 c=20
p=23
P=√[23(23-12)(23-14)(23-20)]
P=√6831 P= 3√759
P=(abc):4R
3√759 * 4R= 3390
3√759 * R= 840
R= 840 : 3√759 - promień okegu opisanego
P=p*r
3√759= 23 * r
r=3√759 : 23 - promien okręgu wpisanego
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P= √[p(p-a)(p-b)(p-c)]
p= ½(a+b+c) a=12 b=14 c=20
p=23
P=√[23(23-12)(23-14)(23-20)]
P=√6831 P= 3√759
P=(abc):4R
3√759 * 4R= 3390
3√759 * R= 840
R= 840 : 3√759 - promień okegu opisanego
P=p*r
3√759= 23 * r
r=3√759 : 23 - promien okręgu wpisanego