special triNGLES

Lesson Goal Check:

the students can recognise isosceles and equilateral triangles.  They can also calculate angles of these two special triangles.

special triangles

special triangle 1

isosceles triangle

- two legs of the same length and one base

- two base angles and one vertex angle

- two angles with the same degree

special triangle 2

equilateral triangle

- all angles are the same size

- all sides are the same length 

Seatwork

Answer questions on Chapter 9.3C with number 41, 42, 44, 46