This study aimed to investigate the effects of computer and Internet usage on the performance of students studying plane geometry. The rapid influx of new technologies and applications has brought advancement that has become an integral part of a person’s identity. According to Amponsah (2010), most youth are largely occupied with chatting with friends, browsing Internet sites, and playing online games. This behavior leads to long hours on the Internet, which causes them to sleep in class or miss class altogether. The proper and efficient use of technology can provide many positive benefits; however, technology can prevent many youth from thinking critically, due to the easy access of information. The instruments used in the study are a plane geometry achievement test and a survey on computer and the Internet usage. The study revealed that the performance of the respondents is satisfactory. The respondents indicate “Very Satisfactory” performance along the congruence of line segments, angles, and triangles. It further revealed that the statement “Computers are used to play interactive games like Dota” is significantly related to the level of performance of the respondents in courses on plane geometry.