Q. 73.7( 3 Votes )

What is the surfa

Answer :

Base perimeter is given as 64 cm.

So base edge


Volume is given as 1280 cm3.


We know that,





h = 15 cm


Let height of pyramid (h) = 15 cm


half of base edge = 8 cm


slant height = l


Applying Pythagoras theorem, we get:


l = √(152 + 82)


= √(225 + 64)


= √289


= 17 cm


Then area of one isosceles triangle



Area of four isosceles triangles = 4×136 = 544 cm2


Base area = 162 = 256 cm2.


Total surface area = (544 + 256) = 800 cm2


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