Geometry - Triangle Inequality

Geometry - Triangle Challenge

Solution

b, d and g will NOT form a triangle.

b - no such triangle can be formed since AC is parallel to BD, they will never meet

d - this triangle cannot be formed. AC and BD will never meet because the angles at A and C are greater than 90 degrees

g - such a triangle cannot be formed. AC and BD will never meet because the length of AC plus BD exactly equals the third side of the triangle. Therefore C and D won't meet until AC and BD lie right on top of AB.

Geometry - Sketching Triangles

Geometry - Sorting and Classifying Triangles

Most groups confused the properties of triangles while sorting and classifying the triangles. The BIG IDEA is that triangles can be classified according to two properties -  angle and side length.