you would add the topp and the side then times it by two i think
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The perimeter is 2 times the length plus 2 times the width.
perimeter is the sum of all side lengths. Since a 9 by 11 has 2 sides 9 inch and 2 sides 11 inch, perimeter is 9+9+11+11 = 40 inches
Well, well, well, aren't you just a math detective today! If the picture frame is 20cm x 16cm and there's 192cm² of picture showing, then the area of the frame is (20 x 16) - 192 = 320cm². Since we know the length and width of the frame, we can solve for the width by dividing the total area by the length, which gives us 320 ÷ 20 = 16cm. So, the width of the frame is 16cm.
a picture, painting, or a drawing
If you know the perimeter, there is no need to find it again.