b) Use your answer to part a) to work out the-size of reflex anǧe \( b \).

To determine the size of the reflex angle \( b \), first recall that the sum of angles in any polygon equals \( 360^\circ \). If you already have the interior angle, let's say \( a \), the reflex angle \( b \) can be found using the formula: \[ b = 360^\circ - a \] If \( a \) is, for instance, \( 100^\circ \), then the reflex angle \( b \) would be: \[ b = 360^\circ - 100^\circ = 260^\circ \] So, whatever the measure of \( a \) is, simply subtract it from \( 360^\circ \) to find \( b \). If you make a mistake in your calculations, just double-check your subtraction and make sure you're working with angles accurately, as it's easy to misread or miscalculate angle measures!