Detailed description
Similar triangles △ABE and △DCE with D a point on interval AE and C a point on BE. ÐAEB = ÐDEC = 30 °, ÐADC = 100 ° and ÐABE = a. Also, DC is marked parallel to AB.
Similar triangles
Similar triangles △ABE and △DCE with D a point on interval AE and C a point on BE. ÐAEB = ÐDEC = 30 °, ÐADC = 100 ° and ÐABE = a. Also, DC is marked parallel to AB.