Ignoring the "?" in your question:

If the "?" is a squared symbol that wasn't caught:

Use the quadratic formula

to get the solutions:

as you can see, the discriminant is negative, so the equation has no solution.
Answer:
Inches
Step-by-step explanation:
Answer: The correct answer is inches because radius and Diameter are always given in a single form unit of measure.
Inches units represents the diameter of the circle.
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<u><em>Hope this helps.</em></u>
Answer:

Step-by-step explanation:
Given



Required
Area of triangle
This is calculated as:

This gives:



--- approximated