If conversion$\_$type $=$ number linked to the Meters to Feet option button, the output should be in Feet units else the output in Meter units.

It can also be written as

If conversion$\_$type $=$ number linked to Feet to Meters option button, the output should be in Meters unit, otherwise the output in Feet

Step$15.$ Now we must add the proper labels to our input and output fields. To do so$,$ enter a formula in cell B$4$ to display the input heading according to the selection made. It should implement:

If conversion type $=$ number linked to Feet button, the output should be the text $$Feet$,$ else the output is $$Meters$.$

Step$16.$ Similar to Step $15,$ enter a formula in cell C$4$ to display the output heading depicting the conversion type.

Step $17.$ Style your sheet the similar to the screenshot shown below.