Question

To bisect a line segment of length $7\mathrm{cm}$, the opening of compass should be more than ___________________.

Answer 1

Construction of a Perpendicular Bisector:

To bisect a line segment of length $7\mathrm{cm}$, the opening of compass should be more than $\frac{7}{2}\mathrm{cm}=3.5\mathrm{cm}$.