Answer is D - square root of 98 Reason Using Pythagorean theory to first solve for base diagonal with known legs 5 and 3. a^2 + b^2 = c^2 5^2 + 3^2 = c^2 25 + 9 = c^2 34 = c^2 Take square root of both sides 5.8 = c
Now find the answer for the diagonal By using the same formula with known legs 5.8 and 8 5.8^2 + 8^2 = c^2 33.6 + 64 = c^2 97.6 = c^2. Round up to 98 Answer is square root of 98
