Step-by-step explanation:
Look, you're taking these kinds of questions too serious and that's why you believe they're hard, now pay close attention:
the areas are defined in cm² but the radius is defined in cm, so you need find the positive root of cm².

and the question wants the base area:

Step-by-step explanation:
=55-k
=55-(-3)
=55+3
=58
hope it helps.