nomor 1 - 4 (pakai jalannya/caranya)

1. DE/BC=AD/AB
4cm/BC=6cm/15cn
BC=15cm*4cm/6cm
=10cm

2. L.selimut tabung=2πr.t
=2*3.14*1*4
=25.12cm2

L.alas=πr2
=3.14*1*1
=3.14cm2

s2=t2+r2
=3.5^2+1^2
=√12.25
=3.5
L.selimut kerucut=πr.s
=3.14*1*3.5
=10.99cm^2

L.p bangun=L.slmt tabung +L alas+L.selimut kerucut
=25.12+3.14+10.99
=39.25cm^3