20
50.265 square mm
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1cm equals 10mm; 2cm equals 20mm. Metric is so easy, it's all in tens!
A circle with a diameter of 4 mm has an area of : 12.57 mm2
Oh, dude, let me break it down for you. So, 2cm is the same as 20mm, right? And if 4mm is a part of that 20mm, then the fraction would be 4/20, which simplifies to 1/5. So, 4mm of 2cm is like 1/5. Easy peasy, right?
20
4mm is 11/64th's of one inch Direct Conversion Formula 4 mm* 1 in 25.4 mm = 0.157480315 in
4mm
20
4 mm = 0.004 metres
The weight of 25 mm would depend on the material it is made of. In general, 25 mm would weigh very little, as it is a measurement of length (thickness) and not weight.
50.265 square mm
4 mm = 0.4 cm
Assuming you mean 5.9mm x 4mm, it's 23.6 mm²
7 mm
The perimeter is 40 mm.