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Nomor 3a:
Diagonal sisi AC, EG, BD, dan FH besarnya sama
AC² = AB² + BC²
AC² = 16² + 8²
AC² = 256 + 64
AC = √300
AC = √3×100
AC = 10√3
Nomor 3b:
Diagonal sisi BG, CF, AH, dan DE besarnya sama
BG² = BC² + CG²
BG² = 8² + 12²
BG² = 64 + 144
BG² = 208
BG = √208
BG = √4×4×13
BG = 4√13
Nomor 3c:
Diagonal sisi AF, BE, DG, CH besarnya sama
AF² = AB² + BF²
AF² = 16² + 12²
AF² = 256 + 144
AF = √400
AF = 20
Nomor 3d:
DR = √p²+l²+t²
DR = √16²+8²+12²
DR = √256+64+144
DR = √464
DR = √4.4.29
DR = 16√29