Tolong bantu kerjain yah kk dengan cara Kerjanya

No. 16.
BC = [tex] \sqrt{ 12^{2} + 5^{2} } [/tex]
[tex]BC = \sqrt{144 + 25} [/tex]
BC = [tex] \sqrt{169} [/tex]
BC = 13 cm

No. 18
l. ABC = a.t/2
330 = 11.t/2
660 = 11.t
60 = t

Maka BC = [tex] \sqrt{ 60^{2} + 11^{2} } [/tex]
BC = [tex] \sqrt{3600 + 121} [/tex]
BC = [tex] \sqrt{3721} [/tex]
BC = 61cm.