Date: September 16- 20, 2019 Grade: 11 Duration: 3 × 80 minutes Topic: Construction Sub-topics: Constructing unique triangles Specific Objectives: On the successful completion of the lesson, students should be able to: 1. Construct a unique triangle given: a) Three sides b) Two sides and an included angle c) One side and two angles. 2. Be adequately prepared for class by having the required geometric instruments. 3. Work quickly to complete given tasks. Instructional Materials: 1. 2. 3. 4. Text: Mathematics: A Complete Course Vol. 2 by R. Toolsie. Protractor Compass Ruler Content Summary: Constructing a Unique Triangle given Three Sides Question 1: Using a ruler and compasses only, construct triangle ABC with AB = 6.5cm, AC = 4cm and BC = 5cm. measure and state the length of angle ABC. Constructing a Unique Triangle given Two Sides and the Included Angle Question 2: Using a ruler and compasses only, construct the triangle PQR, with PQ = 4.9cm, QR = 3.6cm and angle PQR = 120º. Measure and state the length of PR. Constructing a Unique Triangle given One Side and Two Angles Question 3: Using a ruler and compasses only, construct the triangle LMN, with LM = 4.9cm, angle L = 45º and angle M = 30º. Measure and state the magnitude of angle LNM. Evaluation 1: Complete activities from the text Mathematics: A Complete Course Vol 2- pages 744745; questions 26-30, 37-40. Complete attached worksheet. Evaluation 2: ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ____________________