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P=20+13/2 *12
P=33/2 *12
P=16,5*12
P=198
c- to bedzie jedno ramie
a podstawa dolna =20cm
gorna= b-?
h- 12cm
P=(a+b)*h
2
d2+(12cm)2=(13m)2
d2+ 144cm2=169m2 / -144cm2
d2=25cm2 / wypierwiastkowac
d=5cm
teraz 20cm - 2d= b
20cm-2*5cm=10cm
b=10m
teraz mamy wszystkie wymiary
P= (20cm+10cm)*12cm
2
P=180cm2