Closed shapes with straight sides

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1 41 Unit 6 and 7 Properties of 2D shapes Activity 1 Closed shapes with straight sides (polygons). Let s revise the 2D shapes you learnt about in Grade 5 Closed shapes with straight sides triangle quadrilateral pentagon hexagon heptagon / septagon 3 straight sides 4 straight sides 5 straight sides 6 straight sides 7 straight sides Count the number of sides in each 2D shape in the block below. Then copy and complete the table.

2 42 Number of the shape. Number of sides. Name of 2D shape. Total number of each 2D shape. 1 6 hexagon Activity 2 Closed shapes with curved and straight sides. 1. Copy and complete the table. Write the letter of each shape in the correct column. Letter of the shape. Total number of shapes. straight sides only curved and straight sides curved sides only

3 43 Activity 3 Quadrilaterals Remember, a quadrilateral is a closed shape with 4 straight sides. 1. Draw as many different quadrilaterals as you can think of in your book. 2. Copy and complete the sentences. a. A has 5 straight sides. Draw 3 of these shapes in your book. b. A has 6 straight sides. Draw 3 of these shapes in your book. c. A has 7 straight sides. Draw 3 of these shapes in your book. A new 2D shape: the octagon

4 44 An octagon has 8 straight sides. The length of the sides is Activity 4 Matching 2D shapes and their descriptions a. b. c. d. e. f. g. h.

5 45 1. Draw each shape and match it to the correct description. It has 5 straight = sides. It has 5 = angles. It has 6 straight = sides. It has 6 = angles. It has 2 long = sides and 2 short = sides. It has 4 right angles. It has 7 straight = sides. It has 7 = angles. It has 3 straight (=) sides. It may have 1 right angle. It has 8 straight = sides. It has 8 = angles. It has 2 long = sides and 2 short = sides. It has no right angles. It has 4 straight = angles. It has 4 = angles. Activity 5 Angles Remember: An angle is formed when 2 straight lines meet each other. The lines are called the arms of the angle. An angle is the amount of turning that the arms do..ے The symbol for angle is You can make your own right angle measure. Types of angles: Acute angle: Acute angles are smaller than right angles. Right angle: Right angles are 90.

6 46 Obtuse angles: Obtuse angles are bigger than a right angle. Straight angles: Straight angles are 2 right angles. Reflex angles: Reflex angles are bigger than a straight angle. Revolution: A revolution is a complete circle. 1. Write the letter and the name of each angle. a. b. c. d. e.

7 47 Activity 6 Remember us? I have 4 sides of = length. I have 4 right angles. I have 2 long sides of = length and 2 short sides of = length. I have 4 right angles. 1. Draw the above two shapes in your book using the correct Mathematical symbols to show the above information. 2. What does parallel mean? Parallel lines are an equal distant apart and will NEVER touch. 3. Can you think of examples of parallel lines in real life, like the sides of a ladder? Write your objects in your work book. - Another new 2D shape: the parallelogram. Parallelograms have: opposite sides that are equal in length. opposite sides that are parallel. no right angles.

8 48 4. Draw a parallelogram in your work book, filling in all the correct Mathematical symbols. 5. Draw a rectangle and a parallelogram in your book and, underneath them, the headings Similarities: Differences: List as many of each as you can think of. 6. Copy and complete the table. the correct column. Rectangles a. Opposite sides are = b. Opposite sides are parallel c. All angles are right angles. d. There are no right angles. e. The 2D shape is a quadrilateral. f. Opposite angles are = Parallelograms. Activity 7 Triangles A triangle is a closed shape with 3 straight sides.

9 49 There are 4 different kinds of triangles. Isosceles Equilateral Right angled Scalene 1. Copy and complete the table. the correct columns and say how many of that kind of angle is in the shape. Triangle Acute ے Right ے Obtuse ے Isosceles Equilateral Right angled Scalene 2. Count how many triangles are in this figure.

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