Created
July 17, 2013 16:18
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uses crt; | |
var a,b,c:integer; | |
cosa,cosb,cosc:real; | |
rb, rs, rz, ao, ap, at:boolean; | |
begin | |
ClrScr; | |
write('введите строну a = '); | |
readln(a); | |
write('введите строну b = '); | |
readln(b); | |
write('введите строну c = '); | |
readln(c); | |
if (c-b-a>=0) or (b-c-a>=0) or (a-b-c>=0) | |
then | |
begin | |
writeln('ТАКОЙ ТРЕУГОЛЬНИК НЕ СУЩЕСТВУЕТ'); | |
readkey; | |
exit | |
end; | |
cosa:=(sqr(b)+sqr(c)-sqr(a))/(2*b*c); | |
cosb:=(sqr(a)+sqr(c)-sqr(b))/(2*a*c); | |
cosc:=(sqr(a)+sqr(b)-sqr(c))/(2*a*b); | |
writeln; | |
if (a-b=0) and (c-0=a) then rs:=true; | |
if ((a-b=0) and (c-0-a<>0)) or ((a-c=0) and (b-0-a<>0)) or ((c-b=0) and (a-0-c<>0)) then rb:=true; | |
if (a<>b) and (a<>c) and (b<>c) then rz:=true; | |
if (cosa>0) and (cosb>0) and (cosc>0) then ao:=true; | |
if (cosa=0) or (cosb=0) or (cosc=0) then ap:=true; | |
if (cosa<0) or (cosb<0) or (cosc<0) then at:=true; | |
if (rs) then writeln('Треугольник равносторонний'); | |
if (rb) then writeln('Треугольник равнобедренный'); | |
if (rz) then writeln('Треугольник разносторонний'); | |
if (ao) then writeln('Треугольник остроугольный'); | |
if (ap) then writeln('Треугольник прямоугольный'); | |
if (at) then writeln('Треугольник тупоугольный'); | |
Readkey; | |
end. |
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