shortyyashaun
24.02.2020 •
Mathematics
Given n arbitrary real numbers a1, a2, ..., an, prove that at least one of these numbers is greater than or equal to their average. (Clearly state your method of proof in the beginning g
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Ответ:
square; 60; 225.
Step-by-step explanation:
1) using the vectors rules to calculate the lengths of the sides AB; BC; CD and AD. When AB=BC=CD=AD it means, the shape is a square of rhombus.
2) using the vectors rules to calculate the lengths of the diagonales AC and BD. When AC=BD it means, the shape is a square.
3) The perimeter of the square ABCD is 15*4=60.
4) The area of the square ABCD is 15*15=225.
All the details are in the attached picture; answers are marked with colour.