Respuesta :

1) 70
18) 60
15) 60
3) 55
2) 70
check the picture below.

recall that all interior angles in a triangle, add up to 180°.

how did we get angle 21?   well, 180 - 90 - 55.

and angle 23 is a vertical angle of 21, thus equal.

now, a circle has a total of 360°, so, if we take out angles 21 and 23, so 70° from 360°, we're left with 290°, two equal, vertical, angles for 290° will be 145° each, thus angle 22 is 145°.

how did we get  say angle 7?  well, angle  7 is corresponding angle to angle 3, and thus equals.

how did we get angle 6?  well, 180 - 70 - 90.
Ver imagen jdoe0001
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