Answer:
25 cm^2
Explanation:
If the square is divided into 4 pieces, this means that the area of the square is divided into 4 equal piece such that the addition of the areas of each triangle gives the area of the square.
As such, to get the area of each triangle, divide the area of the square by 4.
Area of square = 10^2/4 = 25 cm square
The area of each triangle is 25 cm^2