balok ukuran 16cm x 12 cm x 21 cm panjang diagonal ruang balok

rumus panjang diagonal balok
= √(p2+l2+t2)
= √(16^2+12^2+21^2)
= √841
= 29.

misal :
p = 16
l = 12
t = 21

diagonal sisi alas(ds)
ds² = 16² + 12²
ds² = 256 + 144
ds² = 400


diagonal ruang (dr)
dr² = ds² + t²
dr² = 400 + 21²
dr² = 400 + 441
dr² = 841
dr = √841
dr = 29

jadi panjang diagonal ruang balok = 29 cm