What is the sum of angles in a triangle?
What is the sum of angles in a triangle?
Approach: Recall geometric fact.
180 degrees. Standard property of planar triangles.
Follow-up: What about a quadrilateral?
Key concepts: Euclidean geometry.
What is the sum of angles in a triangle?
Approach: Recall geometric fact.
180 degrees. Standard property of planar triangles.
Follow-up: What about a quadrilateral?
Key concepts: Euclidean geometry.