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I-B question 3.21

 
 
Picture of Kevin wei
I-B question 3.21
by Kevin wei - Thursday, 30 September 2021, 7:33 PM
 

Hello,

I-B question 3.21 need a prove.

Could you please provide me an example of "prove " or a format of "prove"?

I'm a new student and I do not know homework format.

Thanks

Kevin



 
Picture of John Lensmire
Re: I-B question 3.21
by John Lensmire - Friday, 1 October 2021, 11:51 AM
 

Hi Kevin,

The basic idea of a "proof" is just that you need to explain why something is true. Since we often wants students to explain their work for every problem, I often like describing a proof as a question where you already know the answer!

As an example (one part of 3.21) you need to prove that angles 2 and 8 (alternate exterior angles) are equal in the diagram below:


Try to explain why this is true (prove) this using only corresponding angles and vertical angles. Hint: This is not too hard!