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c²= a²+ b²
ac²=ab²+ bc²
ac²=12²+16²
ac²=400
ac=20
sedangkan
b²=c²-a²
cd²= ad²- ac²atau dibalik
cd²=20²-12²
cd²=400-144
cd²=256
cd= √256
cd=16
jadi ac+cd= 20+16
= 36
itu kalo menurut sya