Solve for l l = square root of 3.5^2+15^2

$l = \sqrt{{3.5}^{2} + 15^{2}}$

Raise $3.5$ to the power of $2$ .

$l = \sqrt{12.25 + 15^{2}}$

Raise $15$ to the power of $2$ .

$l = \sqrt{12.25 + 225}$

Add $12.25$ and $225$ .

$l = \sqrt{237.25}$

The result can be shown in multiple forms.

Exact Form:

$l = \sqrt{237.25}$

Decimal Form:

$l = 15.40292180 \dots$