10 items are filed under this topic.
 |
|
|
|
|
|
|
|
|
Rates, percentages and units |
2014-12-30 |
|
From Kenneth:
Hello:
If percentages have no units, why are some percentages called rates, as in interest rate, or
perhaps a tax rate of 7% as an example? A rate has units of different quantities.
I thank you for your reply.
Answered by Robert Dawson. |
|
|
|
|
|
|
Trig functions and the unit circle |
2014-10-02 |
|
From Jake:
I was wondering what conclusions can be drawn about the trigonometric functions and how they work about the circle. Can you also please give me an explanation for it? Thank you.
Answered by Penny Nom. |
|
|
|
|
|
|
Trig functions for angles not between 0 and 90 degrees |
2007-07-16 |
|
From Tim:
My question: Why is the value of a trigonometric function, the same, for an angle over 90 degrees and its reference angle?
How are the angle and its reference related? Do they both form a triangle that has equal sides?
Answered by Penny Nom. |
|
|
|
|
|
|
Inclusive definitions |
2005-12-14 |
|
From Layla:
recently the solvable quandary of 5+5+5=550 came up (the question says that you have to put 1 straight line somewhere in the equation to make it true with out turning the "=" into a "not=" sign).
So two answers were put forward:
545+5=550 (the use of a line converting a + into a 4)
AND
5+5+5(less than or equal to)550
There is currently an argument about the second solution. The disagreement is about whether this sign can be used. One person is arguing that the "less than or equal to" sign defines that the number on the left is in the range 550 and below. The other is saying that since the number (which is clearly defined with no variables) can never equal 550, then the "less than or equal to" sign cannot be used in this case.
Which one is the correct definition?
Answered by Walter Whiteley. |
|
|
|
|
|
|
Is a square a rectangle? |
2004-11-21 |
|
From Carol:
I am a teacher. In an FCAT sixth grade review test, there was a question to the students to draw a square and then they referred to it as a rectangle.
What is the definition that makes a rectangle a square that can be taught to the students without confusing them.
Answered by Walter Whiteley. |
|
|
|
|
|
|
The sides of a circle |
2004-01-07 |
|
From Helena:
My name is Helena and I am 10 years old. On a resent math exam I was asked
the question" How many sides does a circle have?" and I wrote down none. The
teacher said the answer was one side.
Answered by Chris Fisher. |
|
|
|
|
|
|
Definitions and descriptions |
2003-06-08 |
|
From Tammy:
MY DAUGHTERS TEACHER ASKED HER TO GIVE BOTH A DESCRIPTION AND A DEFINITION OF THE FOLLOWING ... CIRCLE, SQUARE, TRIANGLE,HEXAGON...... THE LIST GOES ON. WHAT IS THE DIFFERENCE BETWEEN DEFINITION AND DESCRIPTION ? DO A CIRCLE FOR AN EXAMPLE PLEASE.
Answered by Penny Nom. |
|
|
|
|
|
|
The vertex of a cone |
2003-03-27 |
|
From Holly:
I read your response to Callie about whether a cone has a vertex or not. Is it ONLY a vertex if both halves of the cone are together or can one half of the illustration have a vertex?
Answered by Walter Whiteley. |
|
|
|
|
|
|
Can a square be a rhombus? |
2003-03-04 |
|
From Beth:
Can a square be a rhombus? Some sources say yes, some say no. Some sources define a rhombus as a quadrilateral and parallelogram with equal sides, but without right angles. Some sources say a square is a special case of a rhombus. Clarity, please!
Answered by Walter Whiteley. |
|
|
|
|
|
|
Pyramids and prisms |
2000-01-18 |
|
From Tyler:
What's the definition of a Triangular Prism and a Triangular pyramid.
Answered by Penny Nom. |
|
|
