Answer:
Step-by-step explanation:
Use the Pythagorean Theorem: a^2 + b^2 = c^2 where a and b are the sides and c is the hypotenuse
21^2 + 28^2 = c^2
441 + 784 = c^2
1125 = c^2
Now you need to take the square root of 1125 to find the value of x, which would be approx 33.5
