Answer:
a=sqrt[50]; ?=50
Explanation:
Using the Pytagorean theorem in the right triangle:
A^2+B^2=C^2, with A=a, B=a, and C=10
Replacing in the formula:
a^2+a^2=10^2
Adding like terms:
2a^2=100
Solving for a: Dividing both sides of the equation by 2:
2a^2/2=100/2
a^2=50
Square root both sides of the equation:
sqrt(a^2)=sqrt(50)
a=sqrt(50)