円や扇形、その中心、接線の作図【中学１年数学】

How do you draw circles and sectors? How do you construct their centers and tangents? This is from the plane geometry section of first-year junior high school math. Other problems in this section can be found here: http://www.motiveup.com/archives/3177... Mastering junior and senior high school math problems on my blog: http://www.motiveup.com/ Problem sets where you can ask questions: http://study-doctor.jp/?page_id=4 English lessons with Miki-sensei:    / @mikisenseivideo   Contact (Inquiry Form): http://form1.fc2.com/form/?id=6f50577...