Respuesta :
Hello!
Looking at the given ruler, we can see that the capillary tube's diameter starts at 0cm and goes to 0.4cm. That means that the diameter of this tube is 0.4 centimeters.
The problem has given us how to find the radius when we have a diameter, so we would need to divide it by 2.
0.4 cm / 2 = 0.2 cm
Therefore, the radius of the capillary tube is 0.2 centimeters.