a= 3 cm
h= 8 cm
P= 36 cm²
P=½(a+b)*h
36=½(3+b)*8
36=½*24+8b
36=12+4b
36-12=4b
24=4b /:4
b=6
Odp. Druga podstawa ma 6 cm.
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36*2=72
72/8=9
9-3=6
Druga podstawa ma 6cm.
a= 3 cm
h= 8 cm
P= 36 cm²
P=½(a+b)*h
36=½(3+b)*8
36=½*24+8b
36=12+4b
36-12=4b
24=4b /:4
b=6
Odp. Druga podstawa ma 6 cm.
P=36
a=3
h=8
36 =(3+b)8 / ÷2
36=(24+8b)÷2 całośc razy 2
72=24+8b
8b=72-24
8b=48
b=6cm