Răspuns :
[tex]ma \: = \frac{a+b }{2} \\ ma \: = \frac{4 + 16}{2} \\ \\ ma \: = \frac{20}{2} \\ ma \: = 10\\ mg = \sqrt{a \times b} \\ mg = \sqrt{4 \times 16 } \\ mg = \sqrt{64} \\ mg = 8[/tex]
10 - 8 = 2
10 - 8 = 2