[Solid Mensuration] please help meeee!! :)

(Rofl) Please help me on how to solve diz XD

"A block of Granite is in the form of the frustum of a regular square pyramid whose upper and base lower base edges are 3ft and 7ft.., Respectively, if each of the lateral faces is inclined at an angle of 62^{o} 30' to the base , Find the volume of the granite in block"

as seen on the book "Solid Mensuration By Kern And Bland 2nd Edition" #9 page 71

Thanks in advance !!(Hi)

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Re: [SolidMensuration] please help meeee!! :)

Re: [Solid Mensuration] please help meeee!! :)

thank you sir for the accurate answer and for the explanation. !!!