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x2+12^2=15^2
X2=225-144
X2=81
x=9
a-dłuższa podstawa
b-krótsza podstawa
c-ramię
a=2x+b=18+20=38
O=2c+a+b=2*15+20+38=30+58=88 m
P=1/2(a+b)*h=1/2*58*12=348 m2
1a=100m2
348m2=3,48a
b-krótsza podstawa=20m
c-ramię=15m
h=wysokość=12m
a2+b2=c2
x2+12^2=15^2
x2+144=225
x2=225-144
a2=81
x=pierwiastek81
x=9(m)
a=20m+9m+9m
a=38(m)
obw=a+b+2c
obw=38+20+2*15
obw=58+30
obw=88(m)
P=1/2(a+b)*h
P=1/2*(38+20)*12
P=1/2*58*12
P=1/2*696
P=348 (m2)
1a=100m2
348m2=3,48a