You count each unit square and it counts as one so for number two from point o to point a there are 5 unitsif each side we’re 5 hints and there are 6 sides you multiply five by six to get the answer of 39 for number three
According to my calculations it should be 77
-10x-12y=32
+10x+50y=25
38y=57
Y=1.5
X=-5
Either a or c, don't know which one for sure
All angles around the center point V are 60° because when added together they equal 360°. the angles in a triangle always add up to be 180° and there is 1 right angle which is 90°. so first you subtract 90 from 180 leaving 90 over. then the angle right above it is 60 because it is part of that circle around point V. so you subtract 60 from 90 and what you have left over is the answer.