1.4 Angles & Their Measures
Sep 13th, 2011 by corricelli
Hello,
Please use this section to post questions related to section 1.4. We will cover this section in two days, as follows:
Day 1: HW Due Fri, 9/16 – p. 29: 9-19 odd, 23, 25, 35, 41, 43 (in 41 and 43, find AB also)
Day 2: HW Due Mon, 9/19 – Worksheet given in class
Feel free to use this section of the blog to post questions/concerns/extensions related to section 1.4.
Day 3: HW Due Tues, 9/20 – Wrapping Up 1.4 (Worksheet)
Note – TODAY’s ASSIGNMENT IS ABOVE!!!
Happy Blogging,
Mrs. Corricelli
for numbers 41 and 43 do we need to make a coordinate plane?
Hello,
For all asking about 41 and 43, I did reply earlier about this. You do need a coordinate plane and then use the distance formula to find AB.
Hope this helps,
Mrs. Corricelli
When you say do 41 and 43 and find AB also .. what do you mean by that ? Im confused ….
Kelly,
I did reply earlier about this. You do need a coordinate plane and then use the distance formula to find AB.
Hope this helps,
Mrs. Corricelli
for 41 and 43 you have to use the distance formula to find the ray AB i think
Brian,
Thanks for replying to a teammate – most of your reply was 100% on – you do need the distance formula, but not to find a ray’s distance (a ray has no distance) but to find the length of segment AB.
Again, thank you!
Great teamwork,
Mrs. Corricelli
For problems 41 and 43, I drew a coordinate plane and connected the points. I didn’t use any formula. I also wasn’t sure what you meant by finding A and B.
Kayleigh,
Thanks for the post. See the replies to this question – Carlos was one of the first.
Use the distance formula to find AB.
Hope this helps,
Mrs. Corricelli
Is it alright if I skip ‘finding’ AB because I’m so confused O_o
Carlos,
AB = the distance from A to B. Use the distance formula…
You can do it!
Thanks,
Mrs. Corricelli
I dont have a protractor for #s 23 and 25, so can I just skip them until tomorrow?
i am confused about finding A&B as well
Careful Shane,
AB, not A&B… Maybe a typo? See my post to Carlos… AB = distance from A to B, aka distance formula.
Thank you,
Mrs. Corricelli
For problems 41 and 43 i plotted the points in the coordinate plane I drew and got the same answer as shown on the answer key but I was a little confused like many what you meant by finding AB.
I’m with Rosalynn, I wasn’t sure of that either.
Thanks Mrs. Corricelli I understand how to do it now !
for the AB distance formula we use the formula that i was in class to learn ( (x1-x2)^2 + (y1-y2)^2 ) not the different one we had to use on a question from a previous home work assignment right because i’m a bit confused to be honest.
Hi I am doing the math worksheet and I am having trouble with numbers 10-13…could anyone help me on how to figure it out? thankyou
Alyson,
I hope this was fixed in class… Sorry I missed this on Sunday. The key, as we discussed, is drawing the picture.
Thank you,
Mrs. Corricelli
I’m having trouble on question #4-6, it says to use the Angle Addition Postulate, but what does that mean? Do you use (y=mx+b) ?
Also, I’m having trouble again on questions 7-9 when talking about identifying the interior and exterior coordinate points, To solve that do you use the equation you used in class, (M= y2-y1/ x2-x1)
An,
Looks as though your question is resolved – between class and Alyson’s response.
Thank you,
Mrs. Corricelli
for numbers 4-6 you add the other angles. so for number 4 you would do 21+23=x. then solve for x. You are trying to find the measurement of angle CDF and to do that you have to add the other two angles together. For numbers 7-9, the interior is inside the angle and the exterior is outside. So you just pick a point away from the angle for exterior and a point inside the angle for the interior.
Alyson,
EXCELLENT teamwork!! Keep up the great work!
Happy blogging,
Mrs. Corricelli
Hi , I am trying to do the homework and i am stuck on 10 – 13 .. does anyone know how to do it ?
Kdog,
Hope that you are good on these now?!
Happy Monday,
Mrs. Corricelli
I don’t understand numbers 10-16 on the worksheet for homework. Did anyone get those?
Thanks Alyson!
that helped, and you mean pick a random point within the angle?
yeahh any point
i am having troubles with numbers 10-16
For numbers 10-13, i think you’re suppose to draw an extra ray inside the angles, for ex: P is interior of <SOT, so u should draw a ray inside of it labled as P, and then identify degrees for each angles that equals 71*. (SOT=71*)
An,
EXCELLENT!!! Great post in reply to a teammate! Keep up this great teamwork!
Happy Monday,
Mrs. Corricelli
Btw, i found out that for 14-16, you just add everything up together, For ex: !4.) (x+4)+(2x-2)=26*
For numbers 2-3, are we supposed to simplify the square roots?
Charlie,
Did you look at the solution sheet? Yes, you do need to simplify.
Happy blogging,
Mrs. Corricelli
I’m a little confused with part B of question 4
Charlie,
What have you done? Make this a post that people can reply to… Did you calculate the distances MO, MW, and OW using the distance formula? Did you check your answers against the solution?
Please re-post with a little more detail so that we can all help you to identify the problem/question/solution!
Thank you,
Mrs. Corricelli
9/19/11
On the homework for tonight I had a question on number five. I drew the diagram out and I labeled everything. Next I plugged in “x” which i got was three which came out as:
ACD= 5(12-x)
5(12-3)
60-3=57
BCA= 14x+3
14(3)+3
42+3=45
BCD=30x=30(3)=90
I should have gotten 90 when I added up ACD and BCA. But instead I got 102
Can anyone help me?
Katie,
Love the level of work you showed – I can help in a few ways…
First notation…
Instead of “ACD= 5(12-x)”, write m<ACD = 5(12 – x) because it is the angle's measure that is equal to this equation, not the equation itself. <ACD is an angle, not a number. It seems small, but it is a big concept this year and many people make it at the start of Geometry. You may have saved lots of people points on their quizzes by doing this!
Now, continuing:
m<ACD = 5(12 – x)= 5(12-3) = SO FAR SO GOOD
By order of operations, 5(12-3) = 5(9) = 45 degrees.
By distributive property, 5(12-3) = 5(12) – 5(3) = 60 – 15 = 45 deg
(It looked like you tried to distribute, but forgot to distribute the 5 to the 3.)
Hope this helps!
Mrs. Corricelli