Answer:
a ≈ 8.7 units
Step-by-step explanation:
Using Pythagoras' identity in the right triangle
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides , that is
a² + 5² = 10²
a² + 25 = 100 ( subtract 25 from both sides )
a² = 75 ( take square root of both sides )
a = ≈ 8.7 ( to the nearest tenth )
