Question

How would i find the measurement of angle 1 & 2

Answer 1

Check the picture below.

keeping in mind that a circle has a total of 360°, if the twin angles of 72°  add up to 144°, what remains for the other twin angles is 360° - 144° = 216°, and that 216 is split between both twins for 108 a piece, taking away the 40° next to ∡2, gives us ∡2.