class summary of 17/02

In today's math class, Ms. Saatkamp started the class by giving our quizes back. There was one question in the quiz that no one in our class got it right, which was #2 on the first page. The question asked if AB//YZ in the condition where: XB=3
BZ=2

AB=6
YZ=10
First of all, to answer this question, you

had to remember that AB and YZ could only be pararell when;
1)

(theorem 7-5)

2) A and B are midpoints( theorem 7-6).

In this question, most people simply did

which would be equal to each other. However, the information is not enough to determine that AB//YZ. So the answer to this question was sometimes true.

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After getting our quizes back, Ms. Saatkamp corrected the hw which was assigned last Friday.

The questions that people asked were #27 and #30.

On #27, you had to find the value of x with the given information;

PQ//DF

QF=8

EQ=3

PE=x+2

DP=12
On this question, you had to compare between EQ:QF and PE:DP.
So the calculation would be:

On #30, the book asked to find the perimeter of triangle PQM when t.STV ~t.PQM. You were to first calculate x by making a relationship between PQ:TS and PM:SV.

8x+36=60x+10

x=o.5
Then, to solve the perimeter of t. PQM, there were two ways:

1)Calculate QM and PM, then add the 3 sides.

2)Use theorem7-7 (which Ms. Saatkamp said it was more efficient)

4P=110

P=27.5
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Toward the end of the class, Ms. Saatkamp taught us tips and directions on Geogebra which would be very useful in our math project.

a)First thing she taught us was that you can't modify sclaes on Geogebra, but you have to decide how many centimeters it worth to each unit.

b) It is more convenient if you make o.5 units show on geogebra. You can do this by enlarging the graph.

c) "Segment with given lengh from point"

This is a button in Geogebra that you can choose a point and draw a certain lengh of segment just inserting them. Once you have made the segment, you can move around in any angles with the same lengh. This tool would specially help you in the project.

d) Ms. Saatkamp told us that we only need to put 10 desks in Geogebra. You don't want to waste your time putting 30 desks, so Don't forget this!

Good luck on the test tomorrow!

Mayu