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Mathematics 10 Online
OpenStudy (anonymous):

Figure 1 has 1 triangle , figure 2 has 3 triangles added , figure 3 has 5 triangles added , figure 4 has 7 trianlges added , what is the formula to find out which figure will have 81 triangles

OpenStudy (anonymous):

nevermind figure 9 because 9*9 is 81

OpenStudy (anonymous):

#of triangles =#of figure ^2, the answer is 9

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