Determine the number of sides if the measure of one exterior angle of a regular polygon
is 60°

HELP PLS !!

The sum of the exterior angles of a polygon is always 360 degrees.  In a regular polygon they're all equal, so 360/60=6, a regular hexagon.

6

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.