THIS book treats of the difficult problem of girders forming a circular arc in plan such as are often used to support the balcony of a theatre. The principles on which the general problem may be ...

The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate the length of the arc, we need to know what fraction of the circle is shown.

Circle geometry Arc length is a fraction of circumference ... Working with two-dimensional vectors A vector describes a movement from one point to another. 2D vectors are added from nose to ...