Answer:
340 square inches
Step-by-step explanation:
To find the surface area, calculate the area of each shape and add it together, A pyramid has 1 square and 4 triangles in its net,
Area of square is A=s*s=10*10=100.
Area of a triangle is A= 1/2 b*h = 1/2 (10)(12) = 60.
There are four equal triangles so together there area is 4*60 = 240.
Add the square to it and you have the surface area of the pyramid.
240 + 100 = 340
