Results 1 – 24 of This worksheet is designed to replace a lecture on constructing the midsegments, perpendicular bisectors, and the circumcenter of a. Worksheet – constructing the circumcenter of a given triangle with compass and straightedge. Students will locate circumcenter of a triangle; Students will discover that the circumcenter is equidistant TI-Nspire calculator; Pencil; Straight-edge; Worksheet.

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This is going to be C.

Circumcenter of a Triangle

That’s what we proved in this first little proof over here. We really circumcented have to show that it bisects AB. Or another way to think of it, we’ve shown that the perpendicular bisectors, or the three sides, intersect at a unique point that is equidistant from the vertices.

Well, that’s cicumcenter of neat. If any point is equidistant from the endpoints of a segment, it sits on the perpendicular bisector of that segment. So this means that AC is equal to BC. So let’s just drop an altitude right over here. We can always drop an altitude from this side of the triangle right over here.

Now, let’s go the other way around. So we’ve drawn a triangle here, and we’ve done this before. We call O a circumcenter. And we’ll see what special case I was referring to. So we know that OA is equal to OC.


This length and this length are equal, and let’s call this point right over here M, maybe M for midpoint. And we know if this is a right angle, this worksyeet also a right angle.

So let’s say that C right over here, and maybe I’ll draw a C right down here. So to prove that C lies on the perpendicular bisector, we really have to show that CM is a segment on the perpendicular bisector, and the way we’ve constructed it, it is already perpendicular.

I’ll try to draw it fairly large. And circumccenter, we don’t even have to worry about that they’re right triangles. So let’s apply those ideas to a triangle now. If this is a right angle here, this one clearly has to workshee the way we constructed it. And the whole reason why we’re doing this is now we can do some interesting things with perpendicular bisectors and points that are equidistant from points and do them with triangles.

Circumcenter of a triangle. Let’s say that we find some wworksheet that is equidistant from A and B. You could call this triangle ABC. This distance right over here is equal to that distance right over there is equal to that distance over there. Area circumradius formula proof.

Three points defining a circle. And essentially, if we can prove that CA is equal to CB, then we’ve proven what we want to prove, that C is an equal distance from A as it is from B. And I don’t want it to make it necessarily intersect in C because that’s not necessarily going to be the case.


We know that since O sits on AB’s perpendicular bisector, worksheey know that the distance from O to B is going to be the same as the distance from O to A.

So let me just write it. So it’s going to bisect it. And once again, we know we can construct it because there’s a point here, and it is centered at O.

a Circumcenters Worksheet ∆ ∆

So just to review, we found, hey if any point sits on a perpendicular bisector of a segment, it’s equidistant from the endpoints of a segment, and we went the other way. So that’s fair enough. Actually, let me draw this a little different because of the way I’ve drawn this triangle, it’s making us get close to a special case, which we will actually talk about in the next video. And this unique point on a triangle has a special name. So this is C, and we’re going to start with the assumption that C is equidistant from A and B.