AbstractThis study aims to examine the development and effectiveness of illustrated
dictionary in Trigonometry towards grade ten students’ performance and
motivation. The pre-test and post-test non-equivalent control group quasiexperimental
design was used. The selection of samples was conducted by cluster
probability sampling from two out of 4 campuses of Sharjah American
International Schools (SAIS) involving 60 students. The samples were divided
equally into control and treatment groups of 30 students each. A three-week
intervention was carried out. A set of pre-test and post-test on trigonometry were
used. A motivation questionnaire was given to the treatment group only. A
descriptive analysis was used to describe the students’ performance on the topic,
while an independent t-test was used to determine the differences between the
two teaching strategies. The questionnaire designed to measure the extent of
students' motivation after using the illustrated dictionary was also .....