Today we launched into a mini geometry unit on angles!
Summary of unit key concepts for grade 4
-Recognize and contrast benchmark angles: right angles (90 degrees), straight angles (180 degrees) and half-right angles (45 degrees)
-Angles are measured by the spread of the angle's arms and NOT by the length of the arms or the area in between the arms.
-Smaller angles can be used to measure larger angles (e.g. two half-right angles makes one right angle, four half-right angles equals one straight angle, etc. )
-Compare other angles to benchmark angles (e.g. almost a right angle, almost a little more than a half-right angle, almost a straight angle, etc.)
Summary of unit key concepts for grade 5
-Understand that angles are measured in units called degrees and using a tool called a protractor
-Recognize and contrast benchmark angles: right angles (90 degrees), acute angles (between 0 and 90 degrees), obtuse angles (between 90 and 180 degrees) and straight angles (180 degrees)
-Estimate and measure angle measurements using protractors. Reorient a protractor, as needed, to measure an angle in an unusual orientation
-Understand that only certain combinations of angles are possible in certain shapes (e.g. if a polygon contains four right angles than it must be a square or a rectangle)
After we complete this mini unit on angles, we will explore polygons, 2D and 3D shapes!
LANGUAGE:
We continue with our 'Mystery Book Club' centres and activities. Students are currently working on their mystery story organizers which they will use to write their own mystery stories.
Check out some of the 'settings' their mystery novel or our classroom shared novel, that students created during our centre activities before the March Break:
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