Răspuns :
B=Baza mare
b=baza mica
L=una din laturile neparalele
B+b=85
B-b=23
2B=108
B=54
b=54-23=>
b=31
Perimetru=133
B+b+2L=133
2L=133-31-54=48
L=24
b=baza mica
L=una din laturile neparalele
B+b=85
B-b=23
2B=108
B=54
b=54-23=>
b=31
Perimetru=133
B+b+2L=133
2L=133-31-54=48
L=24
ABCD-trapez isoscel
BC;AD-laturile neparalele
BC=AD
P=AB+BC+DC+AD
P=133
AB-23=DC
AB+DC=85
AB+AB-23=85
2AB=85+23
2AB=108
AB=54
DC=54-23=31
P=54+31+BC+AD
P=133
85+2AD=133
2AD=133-85
2AD=48
AD=24
AD=BC=24
BC;AD-laturile neparalele
BC=AD
P=AB+BC+DC+AD
P=133
AB-23=DC
AB+DC=85
AB+AB-23=85
2AB=85+23
2AB=108
AB=54
DC=54-23=31
P=54+31+BC+AD
P=133
85+2AD=133
2AD=133-85
2AD=48
AD=24
AD=BC=24