# Lesson Notes By Weeks and Term - Senior Secondary 1

Development 3

TERM – 3RD TERM

WEEK FIVE

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 5 periods each

Date:

Subject: Technical Drawing

Topic: DEVELOPMENT 3

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

I.) Develop cones and pyramids using the radial lines methods

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures,

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

 PRESENTATION TEACHER’S ACTIVITY STUDENT’S ACTIVITY STEP 1 INTRODUCTION The teacher explains the radial lines methods of developing cones and pyramids Students listens attentively to the teacher STEP 2 EXPLANATION Teacher guide students to develop cones and pyramids using the radial lines methods. Students exhibit attentiveness and active engagement STEP 3 NOTE TAKING The teacher writes a summarized note on the board The students copy the note in their books

NOTE

DEVELOPMENT 3

Development of cone and pyramids.

The Radial Lines Method is a geometric construction technique used to develop cones and pyramids. It involves drawing lines radiating from a common point (the vertex) to the points on the perimeter of the base shape.

This method provides a visual representation of how cones and pyramids are formed from a central point to the edges of their base shapes.

1. For cones, the base shape is typically a circle. By drawing lines from the vertex to points on the circumference of the circle, you create the curved surface of the cone. The length of these lines determines the height of the cone.

2. For pyramids, the base shape can be any polygon. By drawing lines from the vertex to each vertex of the base polygon, you create the triangular faces that make up the sides of the pyramid.

EVALUATION: 1. The elevation and an incomplete plan of a truncated pentagonal pyramid are given in the figure below. Copy the given view and raw the:

I.) Complete plan;

II.) Auxiliary elevation in the direction of arrow P;

III.) Surface development of the pyramid using JK as the seam;

IV.) The shape of the cut surface.(WAEC)

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively