CA-308 Chapter 12 - Area of Shapes CLASS ACTIVITY 12-F 通 Explaining Why the Area Formula for Triangles Is Valid CCSS CCSS SMP3, 6.G. 1 Materials Optionally, use Downloads 12-7 and 12-8 at bit.ly/2SWWFUX and scissors and tape: Use the moving and additivity principles to explain in three ways why the next triangle has area
(1)/(2)(b*h)
square units for the given choices of
b
and
h
. One explanation should fit naturally with the expression
(1)/(2)(b*h)
, another explanation should fit naturally with the expression
((1)/(2)b)*h
, and a third explanation should fit naturally with the expression
b*((1)/(2)h)
. Why is it valid to describe the area with any one of these three expressions?