How calculate weight per meter of 45x45x5 angle?

To calculate the weight per meter of a 45x45x5 mm angle, you first determine the volume of the angle. The formula for the volume can be approximated as the cross-sectional area multiplied by the length. The cross-sectional area of the angle can be calculated by considering the two legs and the thickness, and then multiplying by the length (1 meter). Finally, multiply the volume by the density of the material (typically for steel, it's around 7850 kg/m³) to get the weight per meter.