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Verified answer
A.FD=AB=12 cm
DE=√FE²-√FD²
=√13²-√12²
=√169-√144
=√25
=5 cm
FD+DE=12+5
=17 cm
b.sudut ACB=sudut DEF
=64°
sudut BAC=180°-(sudut ABC+sudut
ACB)
=180°-(90°+64°)
=180°-154°
=26°