Question

Please solve my answer by explanation
I know answer is 3 but I need explanation please ​

Answer 1

Answer:

Missing side = 7

Step-by-step explanation:

• Length = 3

• Given Perimeter = 20

• Perimeter of rectangle = 2(l+b)

                                   2(3+b) = 20

                                   6 + 2b = 20

                                         2b = 20-6 = 14

                                            b= 14/2 = 7

• verify:

         2(3+7) = 2*10 = 20

Answer 2

Answer:

answer is 7

Step-by-step explanation:

Given,

perimeter of rectangle=20

length=3

we know

perimeter of rectangle=2(l+b)

20=2(3+b)

20=6+2b

20-6=2b

14=2b

b=7