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a=25, b=39, c = 56
a)
p=√p(p-a)(p-b)(p-c)
p=½(a+b+c)=½(25+39+56)=60
p=√60(60-25)(60-39)(60-56)=√60*35*21*4=√176400=420
b)
h= ab/c
h=25*39/56
h=975/56≈17,41
784+h²=1521
1521-784=h²
h²=737
h=√737≈27
P=½h*a
P=½ 27*56=756