Answer :

Given.


Radii of frustum are 12 cm and 5 cm


Slant height is 15 cm


Formula used/Theory.


CSA of frustum is π[R + r] × l


Area of material = CSA of frustum


= π[R + r] × l


= 3.14[12cm + 5cm] × 15cm


= 3.14 × 17cm × 15cm


= 800.7 cm2


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