Quadrilaterals and Triangles

quadrilateral:

 

• 2-D figure with 4 sides
• sum of interior angles =

 

triangle:

• 3 sides
• sum of interior angles =

---

Draw one quadrilateral with equal sides but no right angles.

 

• 2 equilateral triangles
• All sides are equal
• 

 

 

 

Find the size of the third angle of a triangle with angles and . Then draw a similar triangle to this, but twice the size.

Similar – figure with same shape but not the same size

 

 

 

 

 

 

 

* triangle not to scale, approximate