Assignment 21

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course Mth 152

8/3 135am

If your solution to stated problem does not match the given solution, you should self-critique per instructions at

http://vhcc2.vhcc.edu/dsmith/geninfo/labrynth_created_fall_05/levl1_22/levl2_81/file3_259.htm.

Your solution, attempt at solution.

If you are unable to attempt a solution, give a phrase-by-phrase interpretation of the problem along with a statement of what you do or do not understand about it. This response should be given, based on the work you did in completing the assignment, before you look at the given solution.

021. ``q Query 21

Liberal Arts Mathematics II

Asst # 21

03-25-2003

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Question: `q Query 9.2.6 A square must be rhombus **** Is the statement true or false and why?

YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY

Your solution:

Yes because a square has 4 equal sides and a rhombus has equal sides

confidence rating #$&* 3

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Given Solution:

GOOD STUDENT SOLUTION:

This statement is true.

A parallelogram is a quadrilateral with two pairs of parallel sides and a rhombus is a parallelogram with all sides having equal length. All sides of a square have equal length. If a square were not a rhombus then all sides would not be of equal length.

It is not true that a rhombus must be a square. The angles of a rhombus do not have to be right angles, while the angles of a square do. **

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Self-critique (if necessary):

I wasn’t thinking about the angels of the square being right angels, I was just thinking of the sides.

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Self-critique rating #$&*3

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Question: `q Query 9.2.10 Consider the statement: 'A parallelogram must be rectangle and a rectangle must be parallelogram '

• Is the statement true or false and why?

YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY

Your solution:

False a rectangle has to have 2 right angels and a parallelogram just has to have 2 parallel sides.

confidence rating #$&* 2

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Given Solution:

A parallelogram is a quadrilateral having two pairs of parallel sides.

A rectangle is a parallelogram which includes a pair of adjacent sides which meet at a right angle.

A rectangle is a parallelogram but a parallelogram is not necessarily a rectangle, so the statement is false.

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Self-critique (if necessary):

I actually got this right, I think.

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Self-critique rating #$&*3

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Question: `q Query 9.2.18 A plane curve is defined by a rubber band with 4 loops.

• Is the curve simple, closed, both or neither?

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Your solution:

Both because its one continuous band so there is no outlet and it has 4 loops

confidence rating #$&*

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Given Solution:

The curve is closed: If you start from any point on the curve, and continue to follow the curve, you end up where you started.

The curve is not simple, but intersects itself ('crosses over' itself) at three points.

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Self-critique (if necessary):

OK

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Self-critique rating #$&*

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Question: `q Query 9.2.24 A curve consists of an ellipse.

• Is the region inside the curve convex or not, and why?

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Your solution:

Not convex

confidence rating #$&*

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Given Solution:

The region inside is convex because the line segment connecting any two points is completely inside the figure.

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Self-critique (if necessary):

I read that in the book and I still didn’t get it but I understand that as long as the complete line segment is completely in the figure then it is convex.

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Self-critique rating #$&*

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Question: `q Query 9.2.48 Consider the triangle ABC. Angle A is 30 degrees more than angle B, which in turn equals angle C

• What are the measures of the three angles?

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Your solution:

X+x+x+30 deg=180 deg (subtract 30 from both sides and combine the x’s)

3x=150deg (divide 3 from both sides)

X=50deg

confidence rating #$&* 3

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Given Solution:

The figure is a triangle so

Angle A + Angle B + Angle C = 180 deg.

We are also told that angle A is 30 deg more than angle B, so

Angle A = Angle B + 30 deg

If x is the degree measure of B then angle A has measure x + 30 degrees and angle C has measure x degrees. So we have

x + x +30 deg + x = 180 deg

3x + 30 deg = 180 deg

3x = 150 deg

x = 50 deg

Angle B and Angle C are both equal to x, i.e., to 50 deg.

Angle A = 50 deg + 30 deg = 80 deg

To check, 80 + 50 + 50 = 180.

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Self-critique (if necessary):

I didn’t finish out the problem by saying what each triangle is. But I get it

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Self-critique rating #$&*

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Question: `q Query Add comments on any surprises or insights you experienced as a result of this assignment.

There were no really big surprises.

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Self-critique (if necessary):

I had to really think on some of these, but no suprises

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Self-critique rating #$&*3

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&#This looks good. Let me know if you have any questions. &#

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