Aregular octagon can be concave. true or false? explain.

a regular polygon has all equal angles, interior and exterior, as well as all equal sides.

Check the picture below.

the one on the left is a regular octagon, as well as a convex one.

the one on the right is also an octagon, but is concave, the  issue is that, though all sides remain equal, the angles do not, and so is not a regular octagon.

maybe showing the graph would

step-by-step explanation:

-387129 iq

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.