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DB adalah diagonal alas, maka:
DB = 10√2 cm
DM = 1/2 x 10 = 5 cm
Perhatikan ΔDBM
BM² = DB² + DM²
= (10√2)² + 5²
= 200 + 25
BM = √225
= 15 cm
Jadi panjang ruas garis BM adalah 15 cm