Answer:

Step-by-step explanation:

Hope this helps!
Lateral Surface Area of a square pyramid (4 isosceles triangles): For the isosceles triangle Area = (1/2)Base x Height. Our base is side length a and for this calculation our height for the triangle is slant height s. With 4 sides we need to multiply by 4. (hope this will help)
The answer is 16. 1^2 is 1, 2^2 is 4, 3^2 is 9, and 4^2 would be 16.

![\\ \sf{:}\implies side=\sqrt[3]{14}](https://tex.z-dn.net/?f=%5C%5C%20%5Csf%7B%3A%7D%5Cimplies%20side%3D%5Csqrt%5B3%5D%7B14%7D)

Now

Cut it into 10 parts as per question(Open side means five sides hence it will be 5×2=10)

Now divide by previous side

Option D
Answer:
320
Step-by-step explanation:
(45*3.5)+(65*2.5)=320