Save guides, add subjects and pick up where you left off with your BBC account. The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate ...

So in order to compare fractions, the whole needs to be the same. Look at these two circles. \(\frac {1} {4}\) of the blue circle is larger than \(\frac {1} {2}\) of the green circle. But this ...