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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

Hi,

I was wondering if my answers look correct

1- C

1. Draw a Cartesian Coordinate system for yourself, and then determine whether these sets of points form triangles

Set 1: (0,0), (1,1), (0,1)

Set 2: (-1, 0), (1,1), (3,2)

Set 3: (0,0), (5,0), (3,5)

A set 1 line segment, set 2 Triangle, set 3 line segment

Bset 1 Triangle, set 2 Triangle, set 3 line segment

Cset 1 Triangle, set 2 line segment, set 3 Triangle

Dset 1 line segment, set 2 line segment, set 3 line segment

E set 1 Triangle, set 2 line segment, set 3 line segment

F set 1 line segment, set 2 Triangle, set 3 Triangle

2-B

2. I have placed a square that is 2 units long on each side so that its sides are parallel to

the x- or y-axis, but it's center is right on the origin. What are the coordinates of the corners?

A (-1,-1), (1,-1), (-1,-1), (1,-1)

B(1,1), (1,-1), (-1,1), (-1,-1)

C(-1,-1), (-1,-1), (1,-1), (1,-1)

D(1,-1), (-1,1), (-1,-1), (-1,1)

E (-1,1), (-1,1), (-1,-1), (-1,-1)

F (1,1), (1,1), (1,1), (1,1)

3- E

3. What shape do these four points make? (Draw from one to the next in the order given,

and then draw from the last back to the first).

(0,-1), (1,1), (0,3), (-1,1)

A A pentagon

BAn octagon

C A triangle

DA square

E A rhombus

F A cube

4. D

4. Now do the same with this list, and describe the shape.

(0,-1), (0,3), (1,1), (-1,1)

A A square

BTwo acute angles that meet at the acute angles

CA triangle

DTwo right triangles that meet at the right angles

E A rhombus

F Two obtuse triangles that meet at the hypotenuse

What shape is created by the following points? (Do not connect these in order, just connect around the outside of the shape.)

5. C

5. (-1, 0), (2, 0), (2, 4), and (-1, 4)

A a rectangle

Ba square

Ca parallelogram

Da rhombus

E a triangle

F a line segment

6.F

6. (-2, 1), (-6, 1), (-7, 6), and (-3, 6)

A a line segment

Ba trapezoid

Ca square

Da rhombus

E a triangle

F a parallelogram

7. B

7. (1, 1), (1, -3), (9, 1), and (5, -3)

A a line segment

Ba trapezoid

Ca square

Da rhombus

E a triangle

F a parallelogram

8.F

8. (8, 5), (2, -3), (5, -3), and (5, 5)

A a parallelogram

Ba trapezoid

Ca square

Da rhombus

E a triangle

F a rectangle

9.A

9. (-5, 1), (2, 1), (2, -4), and (-13, -4)

A a trapezoid

B a line segment

C a square

D a rhombus

E a triangle

F a parallelogram

10.D

10. (-7, 9), (-3, 13), and (-11, 13)

A a rhombus

B a trapezoid

C a square

D a right triangle

E a circle

F a line segment

*Last edited by zee-f (2012-12-05 13:09:29)*

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 87,238

Hi;

1C is correct.

2 B is correct.

3 E is correct.

4 I get E. Those are the same points as in 3.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,426

hi zee-f

1- C

1. Draw a Cartesian Coordinate system for yourself, and then determine whether these sets of points form triangles

Set 1: (0,0), (1,1), (0,1)

Set 2: (-1, 0), (1,1), (3,2)

Set 3: (0,0), (5,0), (3,5)

A set 1 line segment, set 2 Triangle, set 3 line segment

Bset 1 Triangle, set 2 Triangle, set 3 line segment

Cset 1 Triangle, set 2 line segment, set 3 Triangle

Dset 1 line segment, set 2 line segment, set 3 line segment

E set 1 Triangle, set 2 line segment, set 3 line segment

F set 1 line segment, set 2 Triangle, set 3 Triangle

correct

2-B

2. I have placed a square that is 2 units long on each side so that its sides are parallel to

the x- or y-axis, but it's center is right on the origin. What are the coordinates of the corners?

A (-1,-1), (1,-1), (-1,-1), (1,-1)

B(1,1), (1,-1), (-1,1), (-1,-1)

C(-1,-1), (-1,-1), (1,-1), (1,-1)

D(1,-1), (-1,1), (-1,-1), (-1,1)

E (-1,1), (-1,1), (-1,-1), (-1,-1)

F (1,1), (1,1), (1,1), (1,1)

correct

3- E

3. What shape do these four points make? (Draw from one to the next in the order given,

and then draw from the last back to the first).

(0,-1), (1,1), (0,3), (-1,1)

A A pentagon

BAn octagon

C A triangle

DA square

E A rhombus

F A cube

correct

4. D

4. Now do the same with this list, and describe the shape.

(0,-1), (0,3), (1,1), (-1,1)

A A square

BTwo acute angles that meet at the acute angles

CA triangle

DTwo right triangles that meet at the right angles

E A rhombus

F Two obtuse triangles that meet at the hypotenuse

correct

bobbym: join the points in the order given.

What shape is created by the following points? (Do not connect these in order, just connect around the outside of the shape.)

5. C

5. (-1, 0), (2, 0), (2, 4), and (-1, 4)

A a rectangle

Ba square

Ca parallelogram

Da rhombus

E a triangle

F a line segment

I'm not getting that. Check you plotted them correctly.

6.F

6. (-2, 1), (-6, 1), (-7, 6), and (-3, 6)

A a line segment

Ba trapezoid

Ca square

Da rhombus

E a triangle

F a parallelogram

correct

7. B

7. (1, 1), (1, -3), (9, 1), and (5, -3)

A a line segment

Ba trapezoid

Ca square

Da rhombus

E a triangle

F a parallelogram

correct

8.F

8. (8, 5), (2, -3), (5, -3), and (5, 5)

A a parallelogram

Ba trapezoid

Ca square

Da rhombus

E a triangle

F a rectangle

I'm not getting that. Check the points.

9.A

9. (-5, 1), (2, 1), (2, -4), and (-13, -4)

A a trapezoid

B a line segment

C a square

D a rhombus

E a triangle

F a parallelogram

correct

10.D

10. (-7, 9), (-3, 13), and (-11, 13)

A a rhombus

B a trapezoid

C a square

D a right triangle

E a circle

F a line segment

correct

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

Hi,

#5- (A- rectangle)

#8- (A- parallelogram)

Thank you

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,426

hi zee-f

Both correct, well done!

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

Thanks

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 6,426

hi zee-f,

You are welcome. It is always a delight to help you; your determination to understand the work and your efforts to get to the answers make you the ideal pupil.

Bob

You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei

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**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

And I really appreciate the time your giving me to help !

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