Answer:
297 is the surface area
Explanation:
Ok this problem is very simple.
First lets define some equations.
Area of a triangle: A = 1/2BH
A = Area B = Base H = Height
This equation works for right triangles only.
(because 2 right triangles make a square which is why it's multiplied by 1/2 because it's half a square).
Area of a square: A = BH
Surface area equals all the areas of each side added together.
First lets find the area of one of the triangles.
We know 11 is the base and 8 is the height but the triangle isn't a right triangle.
To make it a right triangle divide the base by 2 so 11/2.
You will get 5.5.
Now find the area!
A = 1/2BH
A = 1/2(5.5)(8)
A = 1/2(44)
A = 22
So now we found the area of the right side as a right triangle but you must multiply it by 2 to get the entire side (because we divided the base by 2).
22(2)=A
44=A
44 is the area of one side of the pyramid but there are 3 other sides (not including the base).
So just do:
44+44+44+44 = A
176 = A
Surface area for the triangles is 176!
Now we must find the area of the square.
A = BH
A = 11(11)
A = 121
Total surface area is all the areas added together so it's:
121+176=A
297