38,б
АD:AC=2:1=>x²+4x²=8²
5x²=64
x=√12.8=2√3.2=4√0.8
V=10*4√0.08*(2*4√0.08)=20*1.28=25.6
ответ: 25.6
39,а
V=(1/3)*a²*h
V=(1/3)*12²*√(144/2)
V=288√2
38,б
АD:AC=2:1=>x²+4x²=8²
5x²=64
x=√12.8=2√3.2=4√0.8
V=10*4√0.08*(2*4√0.08)=20*1.28=25.6
ответ: 25.6
39,а
V=(1/3)*a²*h
V=(1/3)*12²*√(144/2)
V=288√2