Geometry Session 2: Triangles and Quadrilaterals

Session 2, Part A:
Different Triangles

In This Part: Drawing Triangles | Classifying Triangles

The following shows how triangles can be classified according to some of their features:

Angles:

Right Triangles

Acute Triangles

Obtuse Triangles



One right (90°) angle	All angles less than 90°	One angle more than 90°

Sides:

Equilateral Triangles

Isosceles Triangles

Scalene Triangles

Equilateral

Isosceles

Scalene

All three sides are the same length.

Two sides are the same length.

All three sides are different lengths.

Size:

Similar Triangles

Congruent Triangles



Same shape, possibly different size		Same size and shape

Problem A5

More than one feature can be combined into a triangle. Decide which of the following combinations are possible. If the combination is possible, draw a sketch on a piece of paper. If not, explain why not.

a.	a scalene right triangle
b.	an isosceles right triangle
c.	an equilateral right triangle
d.	a right triangle that is also obtuse

Next > Part B: Linkage-Strip Constructions

Session 2: Index | Notes | Solutions | Video