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Without knowing the rule, he ...

Without founding the length of the side, you ...

Without checking division by multiplication, we ...

Without classifying these triangles, she will not ...

Without knowing the rule, he will not be able to calculate.

Without founding the length of the side, you will not be able to calculate the perimeter

Without checking division by multiplication we cannot be sure in the result

Without classifying these triangles, she will not find their area