Lesson 4 When Shapes Join Activity 1[complete the following] 1.Shapes that can be drawn on flat surfaces are called -------figures 2. Number of sides in a triangle is----- 3. The number of triangles in the set of figures [Δ🔺⛛⭕▭▯⛛⊳◯] is ------ Answer: [ 1) Plane figures, 2) 3 sides, 3) 5] Activity 2 [How many triangles in following figures] i) ii) Activity 3 [Answer the following questions as directed. Use straight lines to divide each of the figures given below, as directed. ] Example Use 3 Straight lines and divide the triangle into four smaller triangle: A) Use one straight line and divide the rectangle into two triangle b) Divide the triangle into two smaller triangles using only one straight line Activity 4 [ Match stick Puzzles] i) Remove 3 Sticks to get three triangles ii) A...