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Sladkaya [172]
3 years ago
6

What is a triangular number?

Mathematics
1 answer:
Snowcat [4.5K]3 years ago
4 0
It's a number that counts the objects that can form an equilateral triangle.
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Okay. fist off don't think of them as 5 units each, but 1. so if you were to put it on graphing paper and box squares each time. you would be able to get 8 in for both sides to make a square. Area then would be 1600ft squared because 8 ×5 is 40 and 40×40 is 1600. then you calculate how many squares you used. 8×8=64. and 80-64=16 so 16 pieces are left over. then 9×9 (increasing the square) is 81. so 17 pieces to increase it.
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If there is one-third of a pizza left, and Becky only wants to eat one-half of it, how much of the pizza does she want?
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What the answer to this problem
Lana71 [14]
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Harry solved a quadratic equation. His work is shown below.
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