Part II Day 8

Daily objective: Scale factor of sides and scale factor of area.
Define: Basically this is just rewording what you learned from day 2. So basically apply cross-multiplication to your area of any figure and/or side.

 Here is a repeat video to refresh your memory

These two videos should help you answer, understand, and apply the lesson to real life as well as answer the questions asked in the following quiz.

QUIZ:
 Find the scale factor for the similar figures shown below. The scale should be from the smaller figure to the larger figure.
                                                                         1)

2) Find the missing number.

3) Solve for the scale factor from the small figure to the larger figure

ANSWERS
1) 6/3= 2
     So, the smaller figure is half of the larger figure making the scale 2.
2)   4/12 = 6/?
      If you reduce the first fraction in the proportion set-up then you will have 1/3= 6/?
      The purpose of reducing the fraction is to make for easier numbers.
      Now cross multiply to find the missing number.
      ? = 18 cm squared
3)  Take a number from each figure that are on the same side of the figure.
     For this figure your two possible equations are 8/2 or 24/6.
     When you solve (divide), you get a scale factor of 4.