The square of 15cm, because the height of the shape next to it is 4, and we can find that the height of the square under it is also 4 as 40 (the total area of the rectangle) divided by 10 (the length of the bottom) is 4. This therefore means that the two shapes are congruent because they have the same height and share a base, thus making the answer 15 squared.
The square of 15cm, because the height of the shape next to it is 4, and we can find that the height of the square under it is also 4 as 40 (the total area of the rectangle) divided by 10 (the length of the bottom) is 4. This therefore means that the two shapes are congruent because they have the same height and share a base, thus making the answer 15 squared.