# Cross sectional area

1. ### kiwikahuna

61
1. The problem statement, all variables and given/known data
I'm working on a problem that is asking me to find Young's Modulus. I have the right formula and everything that I need but I can't seem to figure out how to find the cross sectional area of a nylon rope. The rope is 21 m long and 1.4 cm in diameter.

2. Relevant equations

3. The attempt at a solution

Would the cross sectional area be the area: pi(0.7)^2

### Staff: Mentor

Assuming that it has a circular cross-section (a reasonable assumption), then the area would be that of a circle ($\pi r^2$). But be sure to use standard units for the radius.

3. ### nrqed

3,054

yes (but be careful witt the units. This will be in cm^2. You might need to put it in m^2)

EDIT: Doc Al beat me to it :-)