410d Calculate the length of a face diagonal of a prism using Pythagoras' theorem.

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12 m
4 m
6 m
"D"
"F"
"E"
"C"
"B"
"A"

ABCDEF is a triangular prism.
AB=4 m, ED=6 m and AE=12 m.
Angle ABC=90°.

Find the length of the line BD.
Give your answer correct to 1 decimal place.

m