You need a formula to find the length OS a line. It is (x1 + x2) / 2 ... (y1 + y2) / 2
Example: (1,3) (5,3) The first number in the parenthesis is x. Add both of them. 1+5=6 then divide it by 2. 6/2=3. The the second set of numbers in te parenthesis is y. Add both of them. 3+3=6. The divide by 2. 6/2=3. Lastly, you add both x and y together. 3+3=6. And now you answer is 6.
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Angles do not have lengths. They are measured in terms of rotation about the vertex.
-- Find the length of one side. -- Find the length of another side. -- Find the length of the remaining side. -- Add the three numbers. -- Their sum is the perimeter of the scalene triangle.
width = (perimeter-2*length)/2
For a rectangle, area equals length times width. To find the length given the width and area, divide the area by the width.