tolong dong yg bisa jawab pertanyaannya makasih

11.
Tinggi seg limas
= akar 3^2 + 4^2
= akar 25
= 5 cm

luas
= 6 x 6 + 2 x 6 x 5
= 36 + 60
= 96 cm2

18.
Volume
= 1/2 x 8 x 6 x 20
= 480 m3
19.
s1 = 1/2 s2
1 : 2
maka,
v1 : v2
1 : 8