



 
Jhey, The volume of a truncated triangular prim is
where A the area of a right section an e_{1}, e_{2} e_{3} are the lengths of the lateral edges. [1] You have V = 6240 cu cm, lateral edges of lengths 15, 15 and 18 cm and A is the area of an equilateral triangle. Let a be the length of a side of the equilateral triangle and write A in terms of a. Substitute the values into the equation for the volume of the truncated prism and solve for a. Harley [1] On the Volume of a Class of Truncated Prisms and Some Related Centroid Problems, by Murray S. Klamkin, Mathematics Magazine © 1968 Mathematical Association of America  


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