Mathematics Measurement and Geometry Year One Mathematics Year

Mathematics Measurement and Geometry Year One Mathematics | Year 4 | Measurement and Geometry | Geometric Reasoning | Angles | Acute and Obtuse Angles | Lesson 1 of 2

Aim • To identify acute or obtuse angles in regular and irregular 2 D shapes. Success Criteria • • IStatement can identify angles as acute obtuse. 1 Lorem ipsum dolororsit amet, consectetur adipiscing elit. IStatement can compare 2 angles in 2 D shapes. I can classify 2 D shapes using the property of angle. • Sub statement

Acute or Obtuse? Is this angle acute or obtuse? Show your answer by making the matching action. acute obtuse

Acute or Obtuse? Is this angle acute or obtuse? Show your answer by making the matching action. acute obtuse

Acute or Obtuse? Is this angle acute or obtuse? Show your answer by making the matching action. acute obtuse

Acute or Obtuse? Is this angle acute or obtuse? Show your answer by making the matching action. acute obtuse

Acute or Obtuse? Is this angle acute or obtuse? Show your answer by making the matching action. acute obtuse

Acute or Obtuse? Is this angle acute or obtuse? Show your answer by making the matching action. acute obtuse

Acute or Obtuse? Is this angle acute or obtuse? Show your answer by making the matching action. acute obtuse

Acute or Obtuse? Is this angle acute or obtuse? Show your answer by making the matching action. acute obtuse

Triangle Prove It! Is it possible to draw a right-angled triangle which has another angle which is obtuse?

Angles in Triangles A R A The angles in a triangle always total 180 degrees. Therefore in a right-angled triangle, the right angle is 90 degrees, making it impossible for either of the other angles to be obtuse.

Quadrilateral Prove It! Can a quadrilateral have two obtuse angles?

Angles in Quadrilaterals Some, but not all quadrilaterals have 2 obtuse angles. R O A O O O A R R = right angle R R A O A R R O A O R A O = obtuse angle A = acute angle

Quadrilateral Angles Activity

Diving into Mastery Dive in by completing your own activity!

Angle Statements Write a statement about a trapezium that is: Write a statement about a parallelogram that is: a) Never true b) Always true

Aim • To identify acute or obtuse angles in regular and irregular 2 D shapes. Success Criteria • • IStatement can identify angles as acute obtuse. 1 Lorem ipsum dolororsit amet, consectetur adipiscing elit. IStatement can compare 2 angles in 2 D shapes. • Sub statement I can classify 2 D shapes using the property of angle.