The two sides of the triangle are 8dm5cm and 1m3cm respectively. Find its third side if the perimeter of the triangle is 2m63cm?

| February 10, 2021 | education

1. From the problem statement, we know that the perimeter of a given triangle is 2 m 63 cm, therefore we know what the sum of the three sides of this triangle is equal to, because the perimeter is the sum of the lengths of all sides of the figure, that is, in this case, the triangle.

2. We find out what the sum of the two sides of this triangle known to us is equal to, if we also know that the length of one side is 8 dm 5 cm, and the length of the second side is 1 m 3 cm. To do this, we add the lengths of these sides. First, let’s translate the lengths of the sides of our figure to cm.

85 + 103 = 188 cm.

3. Now we find out the length of the third side of the triangle. To do this, from the sum of the three sides, that is, from the perimeter, it is necessary to subtract the sum of the two known sides.

263 – 188 = 75 cm.

Answer: The length of the third side of a given triangle is 75 cm.



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