this post was submitted on 08 Jun 2025
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Learned this one in 6th grade geometry: drawing a square in thr corner doesn't make it 90°
But these are all right angles, as long as the two arcs are centered on the same point as the intersection of the two straight lines.
No, it doesn't, but it does mean that, for the purposes of your 6th grade geometry question, you can assume the angle is a right angle. Even if it visible looks like 45°, if they put a square there, that's 90.
More to the point though, a radius of a circle always meets the circumference at 90 degrees. All the squares in this problem are doing is telling you "this line, if it were continued, would be the radius of the incomplete circle".