[tex]ma = \frac{a \times b}{2} \\ \\ \\ [/tex]
1[tex] \frac{11 \sqrt{6 } \times 7 \sqrt{6} }{2} = \frac{11 \times 6 \times 7}{2} = \frac{462}{2} = 231 \\ [/tex]
[tex] \frac{4 \sqrt{5} \times 20 \sqrt{5} }{2} = \frac{ 4 \times 5 \times 20}{2} = \frac{400}{2} = 200 \\ [/tex]
[tex] \frac{13 \sqrt{7} \times 3 \sqrt{7} }{2} = \frac{13 \times 7 \times 3}{2} = \frac{273}{2} = 136.5 \\ [/tex]
[tex] \frac{8 \sqrt{3} \times 16 \sqrt{3} }{2} = \frac{8 \times 3 \times 16}{2} = \frac{384}{2} = 192 \\ [/tex]
2
[tex] \frac{3 \sqrt{2} \times 5 \sqrt{2} \times 7 \sqrt{2} }{3} = \frac{3 \times 5 \times 2\sqrt{2} \times 7}{3} = 5 \times 2 \times 7 = 70[/tex]
[tex] \frac{4\sqrt{3}\times 5\sqrt{3} \times 3\sqrt{3}}{3} =\frac{4 \times 5 \times 3 \times 2 \sqrt{3}}{3}=40\sqrt{3} [/tex]
[tex] \frac{8 \sqrt{5} \times 3 \sqrt{5} \times 7 \sqrt{5} }{3} = \frac{8 \times 3 \times 2 \sqrt{5} \times 7}{3} = 8 \times 2 \times \sqrt{5 } \times 7 = 112 \sqrt{5} [/tex]
[tex] \frac{9 \sqrt{7} \times 7 \sqrt{7} \times 8 \sqrt{7} }{3} = 3 \times 2\sqrt{7} \times 7 \times 8 = 336 \sqrt{7} [/tex]
