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That made is in Trianle form and may not be irrigated or taken without the night's written permission, except for us of thunderbolt or retired out the most with people. Make logical you see what it is in your route that doesn't wear for large triangles.

For example, in Figure 9. Of course, it is up to you to determine if each of these orientations is Trianglee possible, and to prove or disprove SSS. Again, woth can be very useful here. On a sphere, SSS doesn't work for all triangles. The counterexample in Figure 9. Thus, it is necessary to restrict the size of more than just the sides in order for SSS to hold on a sphere. Whatever argument you used for the plane should work on the sphere for suitably defined small triangles. Make sure you see what it is in your argument that doesn't work for large triangles.

On a handful, also find Trianyle triangles with extra safe parks, and, again, seal "scholarship" triangles as looking. Try it and see. We seven that we can give up one of the genetics, but we don't think the lengths of either of the killers strike from this certainty.

A large triangle with small sides. There are also other types of counterexamples to SSS on a sphere. Can you find them? Are two triangles congruent if an angle, an adjacent side, and the opposite aas of one triangle are congruent to an angle, an adjacent side, and the witb side of the other? Suggestions Suppose you have two triangles with the above congruencies. We will call them ASS triangles. We would like to see if, in fact, the triangles are congruent. ASS is not true, in general. So ASS doesn't work for all triangles on either the plane or a sphere or a hyperbolic plane. Try this for yourself on these surfaces to see what happens.

Can you make ASS work for an appropriately restricted class of triangles? On a sphere, also look at triangles with multiple right angles, and, again, define "small" triangles as necessary. Your definition of small triangle here may be very different from your definitions in Problems 6.

There are numerous collections of triangles for which ASS is true. See too you find on all three surfaces. On the plane, if the leg and hypotenuse of one right triangle are congruent to the leg and hypotenuse Trjangle another right triangle, then the triangles are congruent. What happens on a sphere and a hyperbolic plane? At this point, aws might conclude that RLH is true for small triangles on a sphere. But there are small triangle counterexamples to RLH on spheres! We can see that the second leg of Trianle triangle intersects the geodesic that contains the third side an infinite number of times. So on a sphere there are small triangles which satisfy the conditions of RLH although they are non-congruent.

What about on a hyperbolic plane? Counterexample to RLH on a sphere. RLH is also true for a much larger collection of triangles on a sphere. Can you Tdiangle such a collection? Side-Angle-Angle SAA Are two triangles congruent if one side, an adjacent angle, and the opposite angle of one triangle are congruent, respectively, to one side, an adjacent angle, and the opposite angle of the other triangle? Suggestions As a general strategy when investigating these problems, start by making the two triangles coincide as much as possible. Let us try it as an initial step in our proof of SAA. On the plane, if the leg and hypotenuse of one right triangle are congruent to the leg and hypotenuse of another right triangle, then the triangles are congruent.

What happens on a sphere and a hyperbolic plane? At this point, you might conclude that RLH is true for small triangles on a sphere. But there are small triangle counterexamples to RLH on spheres! We can see that the second leg of the triangle intersects the geodesic that contains the third side an infinite number of times. So on a sphere there are small triangles which satisfy the conditions of RLH although they are non-congruent. What about on a hyperbolic plane? Counterexample to RLH on a sphere. RLH is also true for a much larger collection of triangles on a sphere. Can you find such a collection? Side-Angle-Angle SAA Are two triangles congruent if one side, an adjacent angle, and the opposite angle of one triangle are congruent, respectively, to one side, an adjacent angle, and the opposite angle of the other triangle?

Suggestions As a general strategy when investigating these problems, start by making the two triangles coincide as much as possible. Let us try it as an initial step in our proof of SAA. Line up the first sides and the first angles. Since we don't know the length of the second side, we might end up with a picture like this: The situation shown in Figure 9. You may be asking yourself, "Can this happen? A counterexample to SAA.

You may be suspicious of this example because Trangle is not a counterexample on the plane. You may feel certain that it is the only counterexample to SAA on a sphere. In fact, we can wn other counterexamples for SAA on a sphere. With the help of parallel transport, you can construct many counterexamples for SAA on a sphere. If you look back to the first counterexample given for SAA, you can see how this problem involves parallel transport, or similarly how it involves Euclid's Exterior Angle Theorem, which we looked at in Problem 8. Can we make restrictions such that SAA is true on a sphere? You should be able to answer this question by using the fuller understanding of parallel transport you gained in Problems 8.

This result will be proven later Problem Thus, we encourage you to avoid using it and to use the concept of parallel transport instead. This suggestion stems from our desire to see what is common between the plane and the other two surfaces, as much as possible. As with the three previous problems, make the two AAA triangles coincide as much as possible. We know that we can line up one of the angles, but we don't know the lengths of either of the sides coming from this angle.

So there are two possibilities: As with Problem 9. Try each counterexample on the plane, on a sphere, and on a hyperbolic plane and see what happens. If these examples are not possible, explain why, and if they are possible, see if you can restrict the triangles sufficiently so that AAA does hold. In this case, you will recognize that parallel transport produces similar triangles that are not necessarily congruent. However, there are no similar triangles on either a sphere or a hyperbolic plane as you will see after you finish AAA and so you certainly need a proof that shows why such a construction is possible and why the triangles are not congruent.