One can easily find the units digit by looking for a pattern. For numbers with large powers, they will have a pattern that keeps repeating like a cycle. Depending on the multiple of the power, the pattern can be compared to find the units digit.
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If x2 + y2 = 1, then the point (x,y) is a point on the unit circle.
Square metres
find the vector<1,1>+<4,-3>
Cut it out of a material whose weight per unit of area you know, weigh it, then divide the weight by the weight per unit of area.
To find the area of a book cover in metric units, the most appropriate unit to use would be centimeters. The formula for finding the area of a book cover would be: length x width.