S1=2/5 * 2 1/7=2/5 * 15/7= 30/35=6/7 см2
S2=15/7 * 1/2=15/14=1 1/14 см2
S3=2/5 * 1/2=2/10=1/5 см2
V=2/5 * 15/7 * 1/2=30/70=3/7 см3
S1=2/5 * 2 1/7=2/5 * 15/7= 30/35=6/7 см2
S2=15/7 * 1/2=15/14=1 1/14 см2
S3=2/5 * 1/2=2/10=1/5 см2
V=2/5 * 15/7 * 1/2=30/70=3/7 см3