This research aims to improve the learning process and to increase mathematics outcomes from the students of class X MIA 1 SMA PGRI Pekanbaru with applied Discovery Learning model. This research is a class action research with two cycle. The subject of this research is the students of class X MIA 1 SMA PGRI Pekanbaru in academic year 2018/2019, which total of participants are 30 students, consiā¦