To find the length of the hypotenuse of a right triangle when the lengths of the two legs are given, you can use the Pythagorean theorem, which states:
\[ c = \sqrt{a^2 + b^2} \]
In this case, both legs \( a \) and \( b \) are equal to 7. Plugging in the values:
\[ c = \sqrt{7^2 + 7^2} \] \[ c = \sqrt{49 + 49} \] \[ c = \sqrt{98} \] \[ c \approx 9.899 \]
Rounding to the nearest tenth, the length of the hypotenuse \( c \) is approximately \( 9.9 \).