Solution:
Given:
- Half of diagonal: 10 units
To find the diagonal, multiply half the diagonal by 2.
- => Diagonal = 2(Half of diagonal)
- => Diagonal = 2(10) = 20 units
We also know that the sides of the square are equal. Let's use Pythagoras theorem to solve for the side length (c).
- => 20² = c² + c²
- => 400 = 2c²
- => 200 = c²
- => c = √200 = 10√2
Square the side length to obtain the area of the square.
- => (10√2)² = Area of square
- => (10√2) x (10√2) = Area of square
- => 100 x 2 = Area of square
- => 200 units² = Area of square
The area of the square is 200 units²