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To work out perimeters of shapes

Discover the perimeters of shapes and master protractor use for measuring angles accurately in this educational guide. Learn through fun characters like Mr. and Mrs. Angle!

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To work out perimeters of shapes

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  1. To work out perimeters of shapes Joanne Smithies Our Lady & St. Gerards RCP

  2. First we need to find the length of each side by counting the squares. 8 cm The distance around the outside of a shape is called the perimeter. 6 cm 6 cm 8 cm The perimeter of the shape is 8 + 6 + 8 + 6 = 28cm.

  3. 18cm 18cm What is the perimeter of each of these shapes? 22cm 18cm 26cm

  4. 4cm 4cm 5cm 3cm 3cm 3cm 3cm 3cm 7cm 7cm 3cm 3cm 3cm 3cm 4cm 4cm 3cm 3cm Now find the perimeter of these shapes. They are not drawn to scale. Perimeter = 18cm Perimeter = 22cm Perimeter = 28cm

  5. 5cm 3cm 3cm 3cm 7cm CHALLENGE:Can you find the perimeter for this shape? 3cm 3cm 3cm 5cm

  6. To order Fractions

  7. Learning Objective Use a protractor to draw and measure acute and obtuse angles to the nearest degree.

  8. What are the properties of a protractor?? A protractor Here is a standard protractor like you use in the classroom.

  9. When we use a protractor, we need to line it up correctly. You need to make sure the protractor is lined up correctly. Is this ready to measure the angle?

  10. Were you right......................it wasn’t Look for the upside down ‘T’ in the middle of the straight line on your protractor. This needs to be exactly on the vertex of your angle.

  11. We need to remember..... It doesn’t matter which way round the angle is, you ALWAYS need to line the upside down ‘T’ to the vertex of the angle.

  12. Now you are ready. Read from the 0°, and follow the inner set of numbers.

  13. Once you reach 30° you need to be careful!!! You then need to look at the 1° markings on the outer set of numbers.

  14. What does it measure? This angle measures 35°.

  15. What does it measure? This angle measures......

  16. What does it measure? This angle measures......

  17. Mr Obtuse Angle This is Obtuse. He’s the husband of the family. He’s bigger than Right and Acute . He’s always inside, and he always measures between 90° and 180° (depending on how much dinner he’s eaten!)

  18. Mrs. Right Angle This is me. I’m Mrs. Right Angle. I always measure 90°, my favourite shape is a square, and whats more, no matter what my husband tells you, I’m always right!

  19. Baby Acute Angle This is baby Acute angle. Isn’t he cute?! He loves a hug, and always has his arms out for cuddles! He’s the smallest of the family, measuring less than 90°.

  20. Reflex Angle This is our pet dog, Reflex. He’s always outside. He’s only a pup at the moment so he measures 180°, but he can grow up to 360 °! So he’s definitely the biggest angle. You’ll never see him without that ball in his mouth either, horrid thing!

  21. So, now you’ve met us, let’s see how well you know us... Who am I? I always measure less than 90° I’m the smallest angle I’m very cute!

  22. I’m....

  23. Who am I? I’m always outside I’m the biggest angle I can measure between 180° and 360°

  24. I’m... Reflex Angle

  25. Who am I? I always measure between 90° and 180 ° I’m always inside I’m bigger than Right and Acute

  26. I’m...

  27. Who’s left?

  28. YOUR TASK! Draw an angle Estimate it’s size in degrees Measure Write what type of angle it is

  29. To order Fractions, Decimals and Percentages.

  30. Learning Objective Measure and calculate angles at a point.

  31. How many right angles in a circle? HOW MANY DEGREES IN A CIRCLE? HOW MANY DEGREES IN A STRAIGHT LINE? 90°

  32. WHAT ARE THESE ANGLES? A 120 °

  33. Calculate the missing reflex angle 313° 47°

  34. Calculate the missing straight line angle 111° 69°

  35. Calculate the missing reflex angle 234° 126°

  36. Calculate the missing straight line angle 35° 103° 42°

  37. Learning Objective Calculate angles in a triangle.

  38. Property of triangles • The sum of all the angles equals 180º degrees. 60º 60º 60º 60º + 180º 60º 60º

  39. What is the missing angle? 70º 70º ? ? + 180º 70º 70º

  40. What is the missing angle? 90º 30º ? ? + 30º 90º 180º

  41. What is the missing angle? 60º 60º ? ? + 180º 60º 60º

  42. What is the missing angle? 30º ? 78º ? + 78º 30º 180º

  43. What is the missing angle? 40º ? 40º ? + 40º 40º 180º

  44. Equilateral Triangle All 3 Sides are equal in Length All 3 interior angles are the same

  45. Isosceles Triangle Two Sides of equal Length Two interior angles are the same

  46. Scalene Triangle No Sides of equal Length All interior angles are different

  47. Right-Angled Triangles Right-Angled Triangles can be either Isosceles or scalene triangles They have an Interior angle of 90 degrees Scalene Right Angled Triangle Isosceles Right Angled Triangle

  48. Learning Objective Calculate angles in a triangle.

  49. ? obtuse acute reflex right

  50. ? obtuse acute reflex right

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