A, b and d are points on the circumference of a circle centre o.
edc is a tangent to the circle.
angle bdc = 57°
find the size of angle aob.
you must give a reason for each stage of your working.

e) none of the above because the measure of angle cba is 101°

step-by-step explanation:

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation:

answer: 16

step-by-step explanation: first you would add 6+6 which equals 12 then add 2+2 which equals 4. then add 12 + 4 which is 16.

hope this ^_^