![]() In contrast, the mean torque during the reaming process was identical in all four groups. The feed rates of the reamers with rotation in the same direction as the cutting direction were significantly increased compared to rotation in the opposite cutting direction (CCRLC vs. In addition, the feed rate measurement was analyzed using a modified digital caliper. This was then used to determine the required torque. A specially constructed test system was used for this series of tests, with which the respective intramedullary channel were reamed step by step. Right- and left-cutting reamers with conical design were each introduced into five synthetic femurs in both clockwise and counterclockwise rotation with constant feed force. The aim of this biomechanical study is to evaluate the best combination of a right- or left-cutting reamer with a clockwise- or counterclockwise-rotating insert in terms of preparation and safety. Design and direction of rotation of the reamer are potential influencing factors. The use of reamers sometimes exerts high torsional forces on the bone. Reach out to Varsity Tutors today, and we'll pair your student with a suitable tutor.Preparation of the femoral proximal medullary cavity by reaming is essential for intramedullary nail osteosynthesis and hip revision arthroplasty. Unlike classroom sessions, students can turn to tutors whenever they feel stuck. Your student will also have many opportunities to ask questions during their tutoring sessions. Tutors can also help your student learn at a productive, manageable pace - whether they want to steam ahead toward new challenges or slow down to revisit past concepts. Tutors can also personalize your student's sessions in other ways, catering to their ability level, hobbies, and much more. Tutoring can help students learn via methods that match their learning styles, whether they're visual, verbal, or hands-on learners. Rotations may be difficult for some students to grasp - especially if they are not visual learners. Topics related to the RotationsĬenter of Rotation Flashcards covering the RotationsĬommon Core: High School - Geometry Flashcards Practice tests covering the RotationsĬommon Core: High School - Geometry Diagnostic TestsĪdvanced Geometry Diagnostic Tests Pair your student with a tutor who understands rotations This also means that a 270-degree clockwise rotation is equivalent to a counterclockwise rotation of 90 degrees. For example, a clockwise rotation of 90 degrees is (y, -x), while a counterclockwise rotation of 90 degrees is (-y,x). If we wanted to rotate our points clockwise instead, we simply need to change the negative values. Note that all of the above rotations were counterclockwise. This means that the (x,y) coordinates will be completely unchanged! ![]() We don't really need to cover a rotation of 360 degrees since this will bring us right back to our starting point. When rotating a point around the origin by 270 degrees, (x,y) becomes (y,-x). Now let's consider a 270-degree rotation:Ĭan you spot the pattern? The general rule here is as follows: When we rotate a point around the origin by 180 degrees, the rule is as follows: We can see another predictable pattern here. Now let's consider a 180-degree rotation: With a 90-degree rotation around the origin, (x,y) becomes (-y,x) We might have noticed a pattern: The values are reversed, with the y value on the rotated point becoming negative. Let's start with everyone's favorite: The right, 90-degree angle:Īs we can see, we have transformed P by rotating it 90 degrees. Some of the most useful rules to memorize are the transformations of common angles. There are many important rules when it comes to rotation. On the other hand, we can also use certain calculations to determine the amount of rotation even without graphing our points. We measure the "amount" of rotation in degrees, and we can do this manually using a protractor. Just like the wheel on a bicycle, a figure on a graph rotates around its axis or " center of rotation." As it turns out, the mathematical definition of rotation isn't all that different. We can even rotate ourselves by spinning around until we get dizzy. After all, the wheels on a bicycle or a skateboard rotate. We're probably already familiar with the concept of rotation. But how exactly does this work? Let's find out: What is a rotation? ![]() ![]() One of these techniques is "rotation." As we might have guessed, this involves turning a figure around on its axis. As we get further into geometry, we will learn many different techniques for transforming graphs. ![]()
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