6 items are filed under this topic.
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Is it a rectangle? |
2009-10-29 |
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From sefora:
The coordinates of the vertices of quadrilaterals are given.
Draw each quadrilateral on a grid.
Determine whether it is a rectangle (show your work)
P(5,1), Q(-4,4), R(-6,-2), S(3,-5)
Answered by Penny Nom. |
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The product of gradients between 2 perpendiculars lines |
2009-06-11 |
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From Alister:
how do i prove that the product of gradients between 2 perpendiculars lines equal to -1....
Answered by Penny Nom. |
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Proving a quadrilateral is a rectangle |
2007-07-14 |
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From Sonja:
I was having this discussion with another teacher and we need a third opinion. When you are trying to prove a quadrilateral is a rectangle which method should you use:
- Prove the shape is a parallelogram by doing slope 4 times by stating that parallel lines have equal slopes. Then proving a right angle by stating that perpendicular lines have negative reciprocal slopes.
- Doing the slope 4 times and stating that the shape is a rectangle because opposite sides are parallel because of equal slopes and it contains a right angle because of negative reciprocal slopes.
I guess the real question is do you have to first state that the shape is a parallelogram?
Answered by Stephen La Rocque. |
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The slopes of the sides of the Great Pyramid |
2002-02-09 |
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From Christina:
The Great Pyramid is the largest of the Egyptian pryamids. When it was built, it was 481 feet tall and had a square base with 755-foot sides. The pyramid has two different slopes-one along its sides and the other along its edges. Which slope is steeper?
Answered by Penny Nom. |
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Lines in the plane |
2001-10-21 |
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From Greg:
*If the line with equation 3x-4ky= -16 has y-intercept -2, find k. *Write the equation of the line passing through (2,5) and perpendicular to the line passing through (2,-4) and (6,1)
Answered by Penny Nom. |
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Slopes of curved lines |
1999-06-09 |
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From Stephen Ehrler:
When one plots the graphs of y=2x, y=3x, y=xx When each of these graphs pass through point (0,1) do they have the same slope? I know they are different lines but is it possable that they have the same slope at point (0,1).
Answered by Harley Weston. |
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