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L=d1.d2/2
L=(15+6).(8+8)/2
L=21.16/2
L=168 cm
no.7
L=d1.d2/2
250=(10+10).d2/2
250=20.d2/2
250=10.d2
jadi d2=250/2
d2=125
maaf kalau salah