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Secondary 1 | Maths
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Date Posted: 1 year ago
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Number triangle with 3 dots = 1
Number triangle with 4 dots = 1+3 = 4
Number triangle with 5 dots = 1+3+6 = 10
Number triangle with 6 dots = 1+3+6+9 = 19
Number triangle with 7 dots = 1+3+6+9+12 = 31
Formula is t = (1/2)(3d²–15d+20)
Number triangle with 4 dots = 1+3 = 4
Number triangle with 5 dots = 1+3+6 = 10
Number triangle with 6 dots = 1+3+6+9 = 19
Number triangle with 7 dots = 1+3+6+9+12 = 31
Formula is t = (1/2)(3d²–15d+20)
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