Question

. If the perimeter of the following quadrilateral is 21.8 cm Find the fourth side
5 cm
3.7cm
X
1​

Answer 1

Answer:

perimeter of quadrilateral = sum of all sides

21.8= 5+ 3.7 +x+ 1

21.8 = 9.7 + x

21.8- 9.7 = x

12.1 cm = forth side

Step-by-step explanation:

hope it helps

Answer 2

Answer:

$perimeter \: of \: quadrilateral = sum \: of \: all \: sides \\ = 21.8 = 5 + 3.7 + 1 + x \\ 21.8 = 9.7 + x \\ x = 21.8 - 9.7 \\ x = 12.1cm= fourth side$