а) S = 1/2 * h* 10
h = √(8,5^2-6.8^2)=5.1
S=25.5
P=8.5+6.02+10=24.52
b) S = S1 + S2
S1=1/2*a*40.37, a = √(55^2+23^2)≈59.6
S2=1/2*55*23
S=1203.3+632.5=1835.8
P=72+40.37+55+23=190.37
