Jawabanmu

2014-05-08T19:02:59+07:00
DF = AC = 15 cm
BC =  \sqrt{ AB^{2} - AC^{2} }
BC =  \sqrt{25^{2} -  15^{2}}
BC =  \sqrt{625 - 225}
BC =  \sqrt{400}
BC = 20 cm

V = L. alas × tinggi
V = (AC × BC)/2 × BE
V = (15 × 20)/2 × 30
= 300/2 ×30
=150 ×30
= 4500 cm^3