One side of the quadrangle is 57.6 cm, the second is 16.8 cm larger, and the third is 2 times less than the sum

| June 2, 2021 | education

One side of the quadrangle is 57.6 cm, the second is 16.8 cm larger, and the third is 2 times less than the sum of 1 and 2 sides. How many cm is the fourth side if the perimeter of the quadrilateral is 240.8 cm?

1) What is the second side of the quadrangle?

57.6 + 16.8 = 74.4 (cm)

2) What is the sum of the first and second sides of the quadrangle?

57.6 + 74.4 = 132 (cm)

4) What is the third side of the quadrangle?

132: 2 = 66 (cm)

5) What is the sum of the three sides of the quadrangle? You can fold the three sides of the quadrangle, or you can add the third side to the sum of the first two sides.

132 + 66 = 198 (cm)

6) What is the length of the fourth side of the quadrangle? It is necessary to subtract the sum of the three sides of the quadrangle from the perimeter (the perimeter is the sum of the lengths of all sides).

240.8 – 198 = 42.8 (cm)

Answer. 42.8 cm.



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