100 square inches.
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The most compact shape 77.5 square inches can be is a circle with a radius of of 4.97 inches (approx). It can be a rectangle that is 10 inches long and 7.75 inches wide or 1 mile long and 0.0012232 inches wide (approx) or even longer and thinner.
The area of the sector of a circle which has a diameter of 10 inches if the length of the arc is 10 inches is: 25 square inches.
Yes into 10 inches by 10 inches squares
Twelve inches is a length. It can be a diameter, but if it is a diameter, you would simply say 'The circle is 12 inches diameter'. So; how big is it - it is 12 inches.
10 inches