1. You have that:
-Each blade on a windmill is in the shape of a triangle.
- The triangle has the following dimensions: the base is 7 feet and the height is 4 feet.
- There are four blazer on the windmill.
2. Then, to solve this problem, you must apply the formula for calculate the area of a triangle, which is:
A=bxh/2
b is the base of the triangle (b=7 feet)
h is the height of the trianlge (h=4 feet)
3. Therefore, you have:
A=bxh/2
A=(7 feet)(4 feet)/2
A=28 feet²/2
A=14 feet²
4. The total area is:
At=Ax4
At=(14 feet²)(4)
At=56 feet²