tolong di jawab yaa terima kasih

1.Diagonal ruang kubus kecil = 1/3 s akar 3 = 6 akar 3
= 1/3 s = 6
s = 6 x 3 = 18
2.Lp = 2x (1/2xaxt)xT
= 2x (1/2 x 10x10)x15
= 2x 5x10x15
= 1.500 cm
V = 1/2 xaxbxt
= 1/2 x10x10x15
= 50 x 15
= 750 cm
3.a. 11x5 = 55
385:55 = 7
nilai x adalah 4
b. 11x5 = 55
385:55= 7
c. Lp = 2x((pxl)+(pxt)+(lxt))
= 2x(55+77+35)
= 2x 167 = 202
4. Lp = 5xs2
= 5x11x11
= 5x 121 = 605
karena kubusnya gak ada tutupnya