This document provides information about a mathematics lesson for 9th standard students on the topic of the perimeter of a circle. It includes the name of the teacher, subject, unit, topic, and date. It describes the symbols, facts, concept, and formula related to the perimeter of a circle. It outlines the expected learning outcomes and pre-requisites. It lists the teaching and learning resources to be used, including models, charts and classroom interactions. The teacher will use examples and questions to help students understand and recall information about circles and their perimeters.