There are many ways of introducing mathematics. Students are invited together to analyze from the picture to find the long concept of internal alliance tangents. Thus more impressive students to understand and memorize the formula because it analyzes itself how the circle tangent length ep formula is obtained. The Mathematics Learning Change Expected. A teacher should not only teach by announcing (telling) or just for comprehension (understanding), but the teachers are required also to facilitate the students to think that they can be students are able to study independently (independent learners), forward-thinking, and creative.

So that our students are expected to become citizens who jointly take responsibility and care for the fate of the nation, state, and citizens. In line with that, the rationality of the addition of lesson hours stated changes in the learning process (from students being told to be students finding out). In general, it can be said that the desired learning changes are learning changes from (1) memorizing or memorizing (rote learning) towards thinking (thinking) and understanding (understanding) and (2) lecture models to approaches: discovery learning, problems based approach, inductive learning, or inquiry learning.

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