tolong jawab pakai cara ya..terima kasih

10.
cari tinggi segitiga,
t^2 = 5^2 + 12^2
t^2 = 25 + 144
t^2 = 169
t = akar169 = 13dm.

cari luas segitiga (bagian dr selimut)
L = 1/2 × a × t
L = 1/2 × 10 dm × 13 dm
L = 65 dm^2

Luas permukaan,
Lp = L.alas + L.selimut
Lp = (10 dm × 10 dm) + ( 4 × L.segitiga)
Lp = 100dm^2 + 4 × 65dm^2
Lp = 360 dm^2 (A)


11.
alas : A
tinggi : A

maka,
V = L.alas × T.prisma
V = (1/4×s×s×akar3) × t
V = ( 1/4 × A × A × akar3) × A
V = 1/4 a^3 akar3 (D)