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Verified Answer :

Volume of a pyramid =1/3BH
B is Area of base here base is triangle
so Area of a triangle=1/2
bh
                                 =1/2
512
                                  =30 cm^2

Volume=1/3
30H
90=1/3
30h
90
3/30=h
(volume is given)
h=9 cm

Answer:

9 cm

Step-by-step explanation:

i took the tesst