(a)[1]
Construct the locus of points that lie inside the triangle and are $5$ cm from $B$.
(b)[2]
Construct the locus of points within the triangle that are the same distance from $AB$ and $BC$.
(c)[1]
Shade, within the triangle, the region made up of points that are more than $5$ cm from $B$ and closer to $AB$ than to $BC$.