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This answer assumes that you are going to cut the moulding ends 45 degrees to attach together at corners.

This answer assumes that the mat width is somewhat larger than the 3 inches around the photo so the mat will extend far enough behind the frame in order to attach it the frame, possibly with a staple gun.

Simply there will be 3 inches on each side, therefore adding 6 inches to the 7 width, becoming 13 inches. Then add twice the moulding width to the 13 inches, giving the length of your top and bottom moulding.

Then for the side mouldings add 6 inches to 10 giving 16 inches plus twice the moulding width, giving the total length of the sides.

Formula would be-

2(7+3+3+moulding width+moulding width) + 2(10+3+3+moulding width+moulding width)

Simplified - 58 inches + (8 x moulding width).

Also allow an extra inch or so for the widths of the blade that you will be using to cut the frame pieces to length at 45 deg.

Q: How many inches of molding will it take to frame a picture with dimensions 7 x 10 inches if there is to be a 3inch mat around the picture?

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The dimensions of the rectangle are 3 inches by 14 inches

An inch is equal to 2.54 centimeters. Divide each of the numbers by 2.54.

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Typically a Frame will have about 1/4 of an inch to play with on the inside dimension so that would make the inside dimensions 5 1/4 x 7 1/4. if your frame is 3 inches you need to double it to make it 6 inches (3 inches for top + 3 inches for bottom = 6 inches for the top and bottom dimensions.) so your final size would be 11 1/4 x 13 1/4

Draw a picture. Since you are taking the margin off all four sides, you are removing it from both the height and length twice, so take 1.5 inches from both dimensions. The answer is 7 x 9.5 inches

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Typically a Frame will have about 1/4 of an inch to play with on the inside dimension so that would make the inside dimensions 5 1/4 x 7 1/4. if your frame is 3 inches you need to double it to make it 6 inches (3 inches for top + 3 inches for bottom = 6 inches for the top and bottom dimensions.) so your final size would be 11 1/4 x 13 1/4

The inside length of the moulding will be the perimeter of the picture = 11 + 8.25 + 11 + 8.25 = 38.5 inches. In addition, you will need more moulding than that because of the mitred corners. At each corner, each length will require an extra sqrt(2) times the width of the moulding. All in all, then, you will require 38.5 + 8*sqrt(2)*W inches where the moulding is W inches wide. I hope this is not a mathematical question because if it is, it is a very poor question since it takes no account of the lengths required for the mitred joints.

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Draw a picture. Since you are taking the margin off all four sides, you are removing it from both the height and length twice, so take 1.5 inches from both dimensions. The answer is 7 x 9.5 inches

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