Respuesta :

WaleMaths
Area = 54cm²

Height = 9m...

I want to believe you made a mistake in writing the unit for the height... Probably 9cm..

Comment if otherwise...

Area = 1/2 × base × height

54cm² = 1/2 × base × 9

Base = (54 × 2)/9

Base = 6×2

Base = 12cm....

Hope this helped...