Find the length of the side AB of the ABCD quadrilateral if its perimeter is 20 cm. AB = 30 mm, 5 cm, 40 mm.
| March 31, 2021 | education
In order to find the side of the quadrangle, if its perimeter is 20 cm and the three sides of the quadrangle are 30 mm, 5 cm, 40 mm, then you need to subtract the sum of the three sides of the quadrangle from the perimeter of the quadrilateral.
d = 20 cm – (30 mm + 5 cm + 40 mm) = 20 cm – (3 * 10 mm + 5 cm + 4 * 10 mm) = 20 cm – (3 cm + 5 cm + 4 cm) = 20 cm – (8 cm + 4 cm) = 20 cm – 12 cm = 8 cm.
This means that the fourth side of the quadrangle is 8 cm.
Answer: 8 cm.
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