 | Thomas S. Shores - 2007 - عدد الصفحات: 384
...fits well in the abstract setting. This is equivalent to the law of parallelograms, which says that the sum of the squares of the diagonals of a parallelogram is equal to the sum of the squares of all four sides. Law of Paral- Example 6.12. Use properties of inner products... | |
 | G. S. Pandey - 2002 - عدد الصفحات: 178
...dependent. 12. If D is mid-point of the side BC of a triangle ABC, show that 13. Prove that the difference of the squares of the diagonals of a parallelogram is equal to four times the product of one of the sides by the projection of the other upon it. 14. If b=3/-r-2/+3*,... | |
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The sum of the squares of the diagonals of a parallelogram is equal to the sum of the squares of its four Dem.— Let ABCD be the a. 
