Answer:
A = 14.8 B = 14.8
Explanation
What you do first is you use the pythagorean theorem to write out the equation
a^2 + b^2 = c^2
a^2 + b^2 = 21^2
a^2 + b^2 = 441
i couldnt find any whole numbers to fit in this equation so just divide 441 by 2
and get the square root of 220.5 which is 14.8 to the nearest tenth for both a and c