ada yang bisa bantu jawab nomor 11

AB = 2
BC = 2

BD = [tex] \sqrt{AB^{2} +BC^{2} } [/tex]
BD = [tex] \sqrt{2^{2} +2^{2} } [/tex]
BD = [tex]2 \sqrt{2} [/tex]

AC = BD = [tex]2 \sqrt{2} [/tex]

AB.BD + AB.AC
= 2.[tex]\sqrt{2} [/tex] + 2.[tex]\sqrt{2} [/tex]
= 4[tex]\sqrt{2} [/tex] + 4[tex]\sqrt{2} [/tex]
= 8[tex]\sqrt{2} [/tex] (E)