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l=60
d1=10
d2=b:1/2
d2=b*2
a=5
c=15
a²+b²=c²
5²+b²=15²
b²=225-25
b²=200
b=√200=√100*2
b=10√2
d2=10√2*2
d2=20√2
p=1/2*d1*d2
p=1/2*10*20√2
p=5*20√2
p=100√2
2.
24-6=18
18:2=9
a=9
c=15
a²+b²=c²
b²=15²-9²
b²=225-81
b²=144
b=√144
b=12
a=24
b=6
h=12
p=1/2(a+b)*h
p=1/2(24+6)*12
p=1/2*30*12
p=30*6
p=180