Question

Mrs. Thornton asked her students to draw a figure with a perimeter of 4x + 4. Shown below are 4 drawings madeby her students. (They are not drawn to scale.) Which one is NOT correct?А2x+11B2x2C.X + 4XDX+ 1X+ 1сdba

Answer 1

The perimeter is 4x+4

the formula of the perimeter of a rectangle is

$P=2l+2w$

for the first drawing

$P=2(2x+1)+2(1)=4x+2+2=4x+4$

It is correct

for the second drawing

$P=2(2x)+2(2)=4x+4$

It is correct

for the third drawing

$P=2(x+4)+2x=2x+8+2x=4x+8$

It is not correct

for the fourth drawing

$P=2(x+1)+2(x+1)=2x+2+2x+2=4x+4$

it is correct

As we can see the incorrect draw is C.