I'm still confused on the coordinate grid perimeter and area problems, like #10 on the Chapter Test. What formula do you use to find the length? Help!!
For #20 on the Chapter Test, I would say sometimes, but when naming a ray, do you always have to start with the endpoint? i.e. If the endpoint was Q, would it always have to be rayQE or rayQW?
Look at the definition of rays & opposite rays on page 12. Opposite rays must be named with the SAME endppoint (interestingly, the "endpoint" is the first point listed when naming a ray... fascinating, eh?).
In #20, are ray-LJ and ray-TJ named with the SAME ENDPOINT?
Am I off on #25? Because for the amount of carpet they have I got 90 ft^2, and for the amount they need I got 300n ft^2.. Am I doing something wrong? :O
For #14 on pg 72, how would I figure that out..? I couldn't make them equal eachother because they are 2 different midpoints..????? What do I do, please help!!
I have no interest in naming postulates or theorems by number, although some of your brains might work better by memorizing things that way. I have little use for memorization unless it assists you in UNDERSTANDING the concepts. So, I won't fight memorization, but I certainly won't demand things like numbering postulates.
A linear pair requires that two adjacent angles form a straight line. Supplementary angles are two angles that sum to 180 degrees. You tell me... is that the SAME THING? Why or why not?
I think you are misreading the diagram on pg 72 #14. 3m+5 is the length of seg-AB. 4m-10 is the length of seg-BC. The red bar on each segment indicates that the segments are congruent. I think you are reading the red bars as if they are midpoints. The congruent segments simply infer that Point B is the midpoint of seg-AC.
For two angles to physically form a line, they must be adjacent and sum to 180 degrees. If they meet both criteria, they are considered to be a linear pair.
IF two angles sum to 180 degrees, they are supplementary, whether or not they are adjacent. If they are not adjacent, then they do NOT form a linear pair.
In an orthographic drawing, you could "hide" a cube or two behind a wall of cubes if you so desired. This would be very mean to do on a geometry test, so the text book and I will refrain from doing so. I reserve the right to be mean at other times as I deem appropriate.
For the test, will we have to know formulas such as the midpoint formula and distance formula? :(
ReplyDeleteFor #4 on the Chapter Test, I can only find 3 coplanar points? EBD
ReplyDeleteWouldn't the answer to all the letters on #6 be 1? Or this that just a trick question?
ReplyDeleteI'm still confused on the coordinate grid perimeter and area problems, like #10 on the Chapter Test. What formula do you use to find the length? Help!!
ReplyDelete~CONFUZZLED
For #20 on the Chapter Test, I would say sometimes, but when naming a ray, do you always have to start with the endpoint? i.e. If the endpoint was Q, would it always have to be rayQE or rayQW?
ReplyDeleteI just looked at the video tutors and found a "Finding Perimeter in the coordinate plane".. I'll watch that and see if it helps!
ReplyDeleteYou are overly concerned about these formulas:
ReplyDeleteThe distance formula is merely an alternate/equivalent view of the Pythagorean Theorem.
The midpoint formula is merely averaging the coordinate values of x & y.
LOOK AT A COUPLE OF EXAMPLES AND THINK ABOUT IT!
(x1+x2)/2 is simply averaging the x values.(y1+y2)/2 is simply averaging the y values.
You are correct with your answer to #6... the answer to #4 is hidden in your answer to #6, I'll let you struggle with that one for awhile!
ReplyDeleteOOOOOOOH...
ReplyDeleteAnd will we have to know the definitions of all the postulates?
I just came back from a game of Geopardy!! :-)
Yup, u gotsk to know the postulates... but memorize the definitions word for word??... that doesn't sound like me.
ReplyDeleteLook at the definition of rays & opposite rays on page 12. Opposite rays must be named with the SAME endppoint (interestingly, the "endpoint" is the first point listed when naming a ray... fascinating, eh?).
ReplyDeleteIn #20, are ray-LJ and ray-TJ named with the SAME ENDPOINT?
For #20, NO!
ReplyDeleteAnd I still don't know #4..
ReplyDeleteI'm still gonna let you struggle with #4... look at some of your answers to #6... be careful, when the plane spins it might knock you off your chair!
ReplyDeleteOkay... Uh oh!
ReplyDeleteAnd I'm not sure about #24 either.. Just to have some variety, I guess?
Am I off on #25? Because for the amount of carpet they have I got 90 ft^2, and for the amount they need I got 300n ft^2.. Am I doing something wrong? :O
ReplyDeleteIt is said that there are no stupid questions, but #24 comes really close in my opinion. Your answer is good enough for me.
ReplyDelete#25 huh? Double check your units... how many feet in a yard? How many square feet in a square yard?
What would be considered a hidden edge? For an orthographic drawing?
ReplyDeleteFor the test, would you ask something like "Name Postulate 6." or "What is the name of Postulate 11?"
ReplyDeleteFor #14 on pg 72, how would I figure that out..? I couldn't make them equal eachother because they are 2 different midpoints..????? What do I do, please help!!
ReplyDeleteWould linear pair and supplementary angles be the same?
ReplyDeleteWill we have calculators to use on the test, to find the square to of numbers, for example?
ReplyDeleteWhat would the answer to #33 on pg 74 be? For the first part, (x1+x2)/2, I got 0/2! Would the answer be undefined?
ReplyDeleteI have no interest in naming postulates or theorems by number, although some of your brains might work better by memorizing things that way. I have little use for memorization unless it assists you in UNDERSTANDING the concepts. So, I won't fight memorization, but I certainly won't demand things like numbering postulates.
ReplyDeleteA linear pair requires that two adjacent angles form a straight line. Supplementary angles are two angles that sum to 180 degrees. You tell me... is that the SAME THING? Why or why not?
ReplyDeleteOk! Gotsk it!
ReplyDeleteAnd for the linear pair..
ReplyDeleteYes.. I think..? Because lines are always 180 degrees.
Speaking of calculators, try inputting 0/2 and 2/0... what do you get back?
ReplyDeleteDoes that answer your question?
If you need to find square roots to the nearest tenth, for example, you will have a calculator to assist you.
ReplyDeleteFor 0/2, I get 0..
ReplyDeleteAnd for 2/0, I get "Error". So I guess #/0 is undefined?
And for the calculator, ok!
ReplyDeleteI think you are misreading the diagram on pg 72 #14. 3m+5 is the length of seg-AB. 4m-10 is the length of seg-BC. The red bar on each segment indicates that the segments are congruent. I think you are reading the red bars as if they are midpoints. The congruent segments simply infer that Point B is the midpoint of seg-AC.
ReplyDeleteCa-peesh?
For two angles to physically form a line, they must be adjacent and sum to 180 degrees. If they meet both criteria, they are considered to be a linear pair.
ReplyDeleteIF two angles sum to 180 degrees, they are supplementary, whether or not they are adjacent. If they are not adjacent, then they do NOT form a linear pair.
Ohhhhh! Now I gotsk it! Ca-peesh!
ReplyDelete& for the angles thingie: Okay.. I'll try to remember.. But I get it.
ReplyDeleteIn an orthographic drawing, you could "hide" a cube or two behind a wall of cubes if you so desired. This would be very mean to do on a geometry test, so the text book and I will refrain from doing so. I reserve the right to be mean at other times as I deem appropriate.
ReplyDeleteHahaha! Got it!
ReplyDeleteThanks for the help, Mr.C!!
ReplyDeleteFor number four in the chapter 1 review, I can only find three coplanar points, unless all points that lie on line ABC are coplanar?
ReplyDelete