Q: What is the perimeter of a rectangle that has width 12mm and length 20mm?

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Since a square has four sides, just multiply the side length by four: 12mm x 4 = 48 mm

-- Find the circumference of a full circle with a diameter of 12 mm.-- The perimeter of the semi-circle is(1/2 the circumference of the full circle) + (the diameter).

The circumference is 75.4mm

Close to 12cm

A right cylinder having a base radius of 12mm and a height of 60mm has a lateral area of approximately 4523.89mm2

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52mm

Since a square has four sides, just multiply the side length by four: 12mm x 4 = 48 mm

You have specified three dimensions. A rectangular area will have a length and a width. If your length is 90m, is the width 25mm or 12mm? I can't make sense of this as it is.

12:5.9 or 120:59

300 sq mm

If it is a square, divide 12 mm by 4. Obviously it is a 3 mm per side. You don't have enough info for a rectangle or other shape unless it is a triangle which would be 4 mm for an equilateral triangle.

25.4 mm in an inch. so, 12mm is just short of 1/2 inch

12mm

Neither mass nor weight can be converted to length.

13mm diameter & 3100 length pl. give me weight

-- Find the circumference of a full circle with a diameter of 12 mm.-- The perimeter of the semi-circle is(1/2 the circumference of the full circle) + (the diameter).

The 6mm eyepiece is stronger than the 12mm eyepiece. A lower focal length eyepiece like the 6mm provides higher magnification and allows you to see more details compared to a higher focal length eyepiece like the 12mm.