#1**+3 **

Whoa whoa whoa. Hold up.

You need to fix your attitude.

Why aren't you smiling on a wonderful day like today, during a pandemic?

JK

I know this is from Intro to Geometry, and if you tell me what week and problem, I can give you a hint.

hugomimihu May 20, 2020

#2**+3 **

Alcumus my guy and I am not in Intro to geometry. I am only in intro to algebra B. I am just trying to prepare for AMC 10 so please dont bully me.Proof:

VVoidSmiley69
May 20, 2020

#3**+3 **

Oh I apologize.

It's nice that you are practicing for it.

I do recall this question from Intro to Geometry but I apologize for not realizing it could have been in alcumus. Give me a second.

OH you have Ruiz???

I had him for Counting and Probability!

hehe

Also I am currently self learning the intro to algebra as well :)

hugomimihu
May 20, 2020

#4**+2 **

Since you know the base angles equal 80, the top angle is 20, so the ABD triangle is isoceles and the top is 20+20 = 40, bottom 70 each.

That means ABD is 70, ADC is 80, so 80-70 = 10?

Im kinda sure that's the answer.

If it's incorrect please let me know.

hugomimihu May 20, 2020

#5**+2 **

Thanks Hugo, it was right! Mr.Ruiz is really good. Also, I am try to prepare for AMC 10, since I only got a 97.5 last time. Do you have any reccomendations of what books to buy, I was going to buy Volume 1 but idk if thats the best option. :D

VVoidSmiley69
May 20, 2020

#6**+2 **

I actually have a bunch of books but don't really use them other than the ones I take.

Intro to Algebra is great, even though I got a 50 something on AMC10 LOL

Intro to Geometry *could* potentially be useful, and Intro to Count+Prob too.

Volume One might be useful but you could then go to AoPS site and see old tests, since they have great explanations.

Good luck on your next AMC!

hugomimihu
May 20, 2020