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P=(a+b)h/2
h=4cm
P=50cm²
50=(a+b)*4/2
100=(a+b)4
25=a+b
L=a+b+c+d
c=7cm
d=7cm
a+b=25cm
L=25+7+7
L=39cm
Obwód tego trapezu wynosi 39 cm.
P=50cm2
c-ramiona
1/2h(a+b)=50
1/2*4(a+b)=50
2(a+b)=50 /:2
a+b=25 -suma obydwu podstaw
Obw=a+b+2c
Obw=25+2*7=25+14=39[cm]
Obwod tego trapezu wynosi 39cm ;))