The scale factor of sides is the same as similar triangles and the same as similar figures. The scale for area is also the same for as far as we are into the math units. This is the same as before, where you have to put one length over the other, and then put it equal to the other similar shape length over x. Then you have to cross multiply and divide by the number next to x.
This is an example of a question on similar lengths/area.
Quiz
1. Find the missing length:
2. Find the missing length
3. Does it matter if the angles are different in the similar shapes?
Answer key
1. The correct answer would be x=4, because you put 6 over 8 is equal to 3 over x, and after cross multiplying, you should end up with 6x=24. Then you divide 24 by 6 and end up with x=4.
2. The right answer for this question is x=10. You should have 5 over 12 equals x over 24. After cross multiplying you should end up with 12x=120, and then divide 120 by 12, and then x=10.
3. The angles do matter, because they are different shapes, although usually they don't give you the angles for the shapes in math so you know they are the same.
Commented on Suzi's blog.
Commented on Suzi's blog.
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