Answer:
a = √10
Step-by-step explanation:
a² + b² = c²
a² + 9² = (√91)²
a² + 81 = 91
a² = 10
hope this helps :)
square root of 10
a^2 + b^2 = c^2
=> a^2 + 9^2 = square root of 91^2
=> a^2 + 81 = 91
=> a^2 = 91 - 81
=> a^2 = 10
=> a = square root of 10
