







tan15° 
20160411 

JOHN pose la question : find the exact value of tan15° in surd form. Penny Nom lui répond. 





The derivative of y = sin (30º + x) 
20121107 

Saskia pose la question : derivative of y = sin (30º + x) Harley Weston lui répond. 





Angle measures 
20120321 

jogiboy pose la question : how can i get the sine theta if the given is 3.14/3 Penny Nom lui répond. 





The rate of change of the area of a parallelogram 
20110405 

Gevork pose la question : Let a parallelogram have sides of 8 and 12 and let vertex angle A be decreasing at a rate of 2degrees per minute. Find the rate of change of the area of the parallelogram when angle A equals 30 degrees. Penny Nom lui répond. 





A cylinder is cut at an angle of 20 degrees 
20100125 

sanjay pose la question : If I have a cylinder with 40mm diameter and I will cut it at an angle
20 degrees so what would be the increased radius or dia.??? of the cylinder Penny Nom lui répond. 





The sum of the angles of a triangle 
20090518 

mary pose la question : prove that the sum of the three angles inside any triangle always add up to 180 degrees? Harley Weston lui répond. 





How many feet does a shadow move per hour? 
20090402 

Zora pose la question : How many feet does a shadow move per hour? Robert Dawson lui répond. 





limit sinx/x 
20090130 

Jackie pose la question : how to evaluate limit sinx/x as x tends to zero if x is in degrees Stephen La Rocque and Harley Weston lui répond. 





1 foot drop every 25 feet 
20090122 

jerry pose la question : 1 foot drop every 25 feet what is the angle of the degree Penny Nom lui répond. 





What angle should he turn? 
20071201 

Jasmine pose la question : Bob is traveling due north he then turns left 45 degrees followed by four 20 degree turns to the right
What is his new heading if he needed to turn so his heading was SSW what direction and what angle should he turn? Walter Whiteley lui répond. 





Is there a practical use for radian measure? 
20071026 

Paula pose la question : Is there a practical use for radian measure in any profession? Which professions might us radian as opposed to degree measure? Harley Weston lui répond. 





Angle of clock hands 
20070131 

Sophia pose la question : How many degrees are in the aute angle formed by the hands of a clock at 2:20 p.m.? Stephen La Rocque lui répond. 





Fahrenheit and Celsius 
20060612 

Doris pose la question : I just know how to do problems with fahrenheit or celcius. Could you show me step by step how to do these? Then I can do it if you can show me each step of the way. Stephen La Rocque and Penny Nom lui répond. 





Degrees and grads 
20060406 

Nazanin pose la question : which angle if you add 15 to its degree we can find its measure by grad? Stephen La Rocque lui répond. 





Cosine of 35 degrees 
20040303 

Jason pose la question : How do you find the exact solution to cosine 35 degrees. Chris Fisher lui répond. 





Radians 
20030116 

Erikson pose la question : I am a student in the 10th grade and attending advanced math at my high school. I was assign to do a report about the unit circle and the radian. But there seems to be no information available about the history of the radian; who first found out about them, which civilizations used it if any. Well, hopefully you'll assist me in this troubling question. Thank you for your kind consideration. Penny Nom lui répond. 





Radian measure 
20010726 

Amy pose la question : i have to find out what is meant by the radian measure of an angle and compare it to the measure of an angle in degrees. Harley Weston lui répond. 





Law of cosines 
20010220 

Emily pose la question : I missed a few days of class and I can't figure out how to solve Law of Cosines problems. I have the notes and formulas but I can't figure out how to do the math involved to answer the problems. I am also getting confused about how to use degrees and seconds in the Law of Sine and Cosine. I can't seem to get the correct answers and I don't really know how to solve them and enter them into my TI 86. Harley Weston lui répond. 





Motivators 
20010116 

Michelle Stapley pose la question : Do you know of any (or where I can find) student motivators for math at the secondary level? Basically any way I can motivate my students to WANT to learn math. Penny Nom lui répond. 





The side length ratios of some triangles 
20000404 

Alexis Lockwood pose la question : I am doing a project for my Math 30B class regarding the side length ratios of 454590 degree and 306090 degree triangles. I would really appreciate any assistance in answering the following questions, or even direction to an appropriate web site or resource on the matter. Harley Weston lui répond. 





Specific heat 
19991222 

Irena pose la question : In transferring 1260J of heat to water, the temperature of 0.20 kg of mercury falls 50 K. Calculate the specific heat capacity of mercury using the equation C= Q/(m)(delta t) i know that Q= 1260J because it's loosing heat and m= 0.2kg and since i have to use 'C i have to convert Kelvins into Celsius (i also know that 'C has to be negative since it looses heat) . . . Harley Weston lui répond. 





Degrees and triangles 
19990909 

Sandra Mills pose la question : Are there any triangles which are not 180 degrees? I am also in need of information on the history of degree measure for an angle. Walter Whiteley lui répond. 





The sum of the angles of a triangle is 180 degrees 
19980219 

Quin Liu pose la question : How do you prove that the sum of the angles of a triangle is 180 degrees? Is there a proof? what is it? Chris Fisher lui répond. 





Trigonometric functions 
19971221 

Calvin Cheng pose la question : My name is Calvin and I have a year 12 question for you to help me with. From a point S, the angle of elevation of the top of a tower due north of it is 20 degrees. From R, due east of the tower, the angle of elevation is 18 degrees. S and R are 100m apart. Find the height of the tower. Harley Weston lui répond. 





Why is a circle divided into 360 degrees? 
19960930 

Kurtis Kredo pose la question : I was recently wondering why a circle has been divided in to 360 degrees. When I asked my physics teacher he could not think of an answer. His guess is that it probably has to do with people long ago using the base 6 number system. I have a small inkling that it has to do with easy conversion or usage with radians or grads. Chris Fisher lui répond. 

