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r=1/2l=6,5
h=√l²-r²
h=√169-42,25
h=√126,75
P=πr²+πrl=π*6,5²+π*6,5*13=π*42,25+π*84,5=126,75πcm³
V=1/3πr²h=1/3*π*6,5²*√126,75=1/3*π*42,25*√126,75=14,083π*√126,75=
=14,083*3,14*√126,75=44,22√126,75cm³