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AD² = √ 20²+16²
=√400 + 256
=√656
AD=25,6 cm
Apabila AC dan AE sejajar maka panjang AE = 16cm
Jadi panjang DE adalah
DE² = √ AD²+AE²
= √25,6² + 16²
= √655,36 + 256
= √911,36
DE = 30,18 cm