Lesson 3-3 Use a protractor and a centimeter ruler to measure the angles and the sides of each triangle. Classify each triangle by its angles and sid

nothjing

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, and

for

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we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

do your own work and don"t cheat.

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the answer is 2/54

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