Exploring Triangles and Shape Properties
Grade 3 Mathematics Discovering geometry in our world
I Can Statements - What We'll Learn
I can identify and classify triangles as right, acute, or obtuse I can describe triangles by their side lengths and angles I can identify and draw lines of symmetry in triangles and other shapes I can identify parallel and perpendicular lines in shapes
Triangle Detective Challenge
Look at the three triangles on your desk Which one do you think is the RIGHT triangle? Turn and talk to your partner about why you chose that triangle Be ready to share your detective reasoning!
Meet the Triangle Family
RIGHT Triangle: Has one square corner (90 degrees) ACUTE Triangle: All corners are smaller than a square corner OBTUSE Triangle: Has one corner bigger than a square corner Every triangle has exactly 3 sides and 3 corners!
Lines of Symmetry - Mirror Magic
{"left":"A line of symmetry divides a shape into two matching halves\nIf you fold along the line, both sides match perfectly\nSome triangles have 1 line of symmetry","right":"Some triangles have 3 lines of symmetry\nSome triangles have NO lines of symmetry"}
Parallel and Perpendicular Line Hunt
PARALLEL lines never meet - like train tracks PERPENDICULAR lines meet at square corners Look around our classroom Find examples of parallel lines Find examples of perpendicular lines Share what you discovered!
Think and Share
Look at this shape sorting challenge: Which shapes have parallel sides? Which shapes have perpendicular sides? Can a shape have both parallel AND perpendicular sides?
Success Criteria - How We Know We've Learned
I can correctly name triangles based on their angles I can explain what makes a right triangle special I can draw lines of symmetry on shapes I can identify parallel and perpendicular lines in real objects I can sort shapes by their line properties