Answer:
The answer is 340ft²
Step-by-step explanation:
From the given diagram
Height a= 12ft
Base b= 10 ft
The square pyramid when unfolded has
1. 4 triangular parts
2. A square part
Hence the surface area of the square pyramid = 4 triangular parts plus square part
We know that the area of a triangle
A=1/2b*h
A= 1/2(10*12)
A= 120/2
A= 60ft²
Area of all 4 triangle = 60*4=
240ft²
Also area of square base
A= b²
A= 10²
A=100ft²
Total surface area = 240+100= 340ft²
