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180°-63°=117°
ODP.:117°-63°-117°-63°
1,2dm=12cm
100%-20%=80%=0,8
h=0,8*12cm=9,6cm
16/2=8 12/2=6
6²+8²=a²
100=a²
a=10
P=ah=10*9,6=96cm²
L=2*12+2*16=24+32=56cm