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By using the fact that opposite sides of a rectangle have the same length.By using the fact that opposite sides of a rectangle have the same length.By using the fact that opposite sides of a rectangle have the same length.By using the fact that opposite sides of a rectangle have the same length.
By using sides we get area of triangle and then using (1/2)heightxbase we get height.
When measuring an angle you have to measure the sides using a protractor.
You cannot. A parallelogram can be flexed: the angles can be altered without affecting the lengths of the sides.
If it has 28 sides then it has 350 diagonals by using the formula 0.5(n^2 -3n) whereas 'n' means number of sides