panjang diagonal ruang balok yang berukuran 24 cm x 8 cm x 9 cm adalah

dR = √24²+8²+9² = √576+64+81 = √721 cm

Diagonal Sisi :
= √p² + l²
= √24 + 8²
= √576 + 64
= √640
= 8√10

Diagonal ruang :
= √Ds² + t²
= √(8√10)² + 9²
= √64.10 + 81
= √640 + 81
= √721
= 26,8