Bantuin ya yang bisa
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AB = CB =4
EB = CB/2 =4/2=2
dgn phytagoras
AE = akar AB^2 + BE^2
= akar 4^2 + 2^2
= akar 16 + 2
= akar 20
=akar 4 x 5
= 2 akar 5
semoga tidak keliru, mohon ditelaah kembali y :-)