Lesson 5

Lesson 5: 

• Math Content and Strategy 

  • Strategy: If the figure doesn't mention "Drawn to Scale," then ASSUME it IS DRAWN TO SCALE. 

  • Content: Triangle Proportionality Theorum (#13 p. 349)  Think of this when parallel lines intersect sides of a triangle -- see the layers of the cake! 

  • Strategy: When you see the word "ratio," think to add an "x." 

  • Strategy: Always start with C when you plug in. 

  • Strategy for Probability: "How many additional marbles must be added..." leads you to think "+ x" and then make the proportion (p. 352 #26).

  • Zero slope is horizontal; Undefined is vertical.

  • Content: The proportion of an angle in a circle is equal to the proportion of the area.  Also, the measure of a central angle is proportional to the QUANTITY IT REPRESENTS (p. 354 #36). 

  • Strategy: Bail on a problem when you've exhausted all strategy and content. Bail confidently.