Area = length x width
Area = 1.25 x 3.4 = 4.25 square meters
Total surface area of cone: πrl + πr²
Assuming the bottom of the cone is closed.
r = r/2, l = 2l
Total surface Area = π*(r/2)*2l + π(r/2)² = πrl + πr²/4
Total Surface Area = πrl + πr²/4
The answer to your question is E. 1/the square root of 2
