Lp-1 Sides of a parallelogram revised.pptx

Parallelogram g8

1. Watch the video on Opposite sides of a Parallelogram are Equal and Parallel https://www.youtube.com/watch?v=VAAnDxNNpVA https://www.youtube.com/watch?v=X1klhqNHeJk ( Parallelogram)

2. Observe the edges of these figures: Do the opposite edges meet at any point , if extended in both the directions? How its edges are? No Parallel

3. L-1 Sides of a Parallelogram . Aim : To deduce the properties of sides of a parallelogram and apply them. Success Criteria: Differentiate between a rectangle and a parallelogram. Deduce the formula for the perimeter of a rectangle and apply it. Differentiate between area and perimeter. Key word : P arallelogram . B- 6 Parallelogram.

4. Recall What is a polygon? A polygon is a closed figure which is bounded by 3 or more than 3 straight lines. What is a quadrilateral?  A quadrilateral is a four-sided two-dimensional shape. What is a parallelogram? A parallelogram is bounded by 4 sides and the opposite sides are parallel and equal. What is meant by parallel lines? Parallel lines are two or more lines that never intersect at any point.

5. What are the special names of the following quadrilaterals? Identify their properties Opposite sides are parallel but lengths of all its sides are equal Opposite sides are equal and parallel. Opposite sides are equal and parallel. One pair of opposite sides are parallel. Opposite sides are parallel but lengths of all its sides are equal Square Rectangle Parallelogram Rhombus Trapezium Dart

6. Rectangle Parallelogram Activity Take 4 toothpicks and form a rectangle. Slightly tilt the tooth picks which lies towards left and right side. What shape will you get?

7. What did you notice about the sides of new shape? The length of the new shape did not change since the length of the toothpicks remains the same. The length of the opposite sides of the parallelogram remain parallel and equal just like the rectangle. What is the difference between the rectangle and parallelogram based on angles? In rectangle, all the angles are right angles but in parallelogram all the angles are not necessarily right angles .

8. What is the perimeter of the given figure? In parallelogram, the opposite sides are equal and parallel. Hence AB = CD =7 CM and AC = BD = 5cm Perimeter of the parallelogram is 7cm +5cm+7cm+5cm = 24 cm . 5 CM 7 CM

9. Find the perimeter of a parallelogram with the length of 2 adjacent sides as 10cm and 15cm. By the property of a parallelogram, opposite sides are equal and parallel Perimeter of the parallelogram = 10cm+15cm+10cm+15cm =50 cm 15 cm 10cm

10. Do S1 Rectangle Kite Trapezium Parallelogram. The difference is that all the angles in a rectangle are right angles while the angles in a parallelogram are not necessarily right angles. angles

11. AB=8.5 cm AD =6.3 cm Perimeter = 2cm + 5cm +2cm + 5 cm =14cm Perimeter = 7.5cm + 3.2 cm + 7.5 cm + 3.2cm =21.4 cm

12. Equal and Parallel Bisect Equal Supplementary = 180º Equal