The rectangle is less than 8.5cm long and less than 4.3cm wide. Prove the perimeter is less than 25.6cm?

| February 1, 2021 | education

1. Find the perimeter of the rectangle knowing the lengths of its sides. For the calculation, we will use the formula for the perimeter of a rectangle P = 2 * (a + b), where a, b are the length and width of the rectangle. Let’s substitute the data for us according to the condition into the calculation formula and calculate the perimeter of the rectangle.

P = 2 * (8.5 + 4.3) = 2 * 12.8 = 25.6 cm perimeter length.

Comparing the obtained value and the one given to us in the condition, we make an unambiguous conclusion. That if the sides are less than the values ​​stated in the conditions, then the perimeter will be less than 25.6 cm.

Answer: If the length of the rectangle is less than 8.5 cm, or its width is less than 4.3, the perimeter will be less than 25.6 cm.



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