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What's on the worksheet
- Name each triangle by its three angles: acute, right or obtuse.70°, 85°, 25°90°, 25°, 65°100°, 50°, 30°60°, 60°, 60°15°, 90°, 75°
- Sort six triangles into acute, right and obtuse groups.
- Name each road sign triangle by its sides: scalene, isosceles or equilateral.
- Ava cuts a square sandwich corner to corner: find the angles of each triangle piece.
- Find what is wrong with Luis's reasoning about a 30, 110 and 40 degree triangle.
- Draw triangles with a ruler and protractor from a 6 cm segment and given angles.
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The free lesson teaches it with worked examples and practice problems.
Classifying triangles: the lesson ›More Chapter 12 worksheets: Lines, angles, symmetry and classifying shapes
- 12.1Acute, right, obtuse and straight angles
- 12.2Perpendicular lines
- 12.3Parallel lines
- 12.4Classifying triangles
- 12.5Naming and classifying polygons
- 12.6Line symmetry