# angle

1. ### Trig - Cofunction angle identities

Could someone explain to me how to solve cofunction idetnies. Here are some I didnt understand how to solve sin(3pi/2 -x)= ? cos(3pi/2 -x)= ? sec(3pi/2 -x)= ?
2. ### How to Calculate Degrees on Angle

I need an equation to figure this out If for every 1 foot my driveway drops 1 inch, what does that calculate out to be as an angle? How would i calculate it?
3. ### inscribed angle help part 2

I could also use some help on this problem. Thanks in advance!
4. ### inscribed angle help

Can someone help me set up this problem. I have no idea what I'm doing. Thanks in advance!

6. ### Angle of Depression

From the top of a lighthouse h meters above sea level at high tide, the angle of depression of a gull standing on a buoy is Theta at high tide and Phi at low tide. Show that the height of the tide is h(cot Theta tan Phi - 1) meters.
7. ### Angle in cyclic Quad

What I have right now is: Angle CDA = 132 degrees (Ext. angles, cyclic quad.) Angle CBA = 48 degrees (Opp. angles, cyclic quad.) OC = OB = OA (given) ..Then I don't know what to do after.
8. ### Finding the x angle

Hello! I need help in finding out what x is. I'm also confused how angle at centre twice at circumference work in this question. I don't know which angle would I pair off with AOD (120º) using angle at centre twice at circumference.
9. ### Evaluate face angle of a decahedron with 10 congruent faces each as a right kite

A decahedron has 10 congruent faces each as a right kite having two pairs of unequal sides a & b (a<b). It has 12 vertices which lie on a spherical surface. I have to calculate the correct value of theta angle (as shown in the diagram). Any help is highly appreciated. thanks...
10. ### How to evaluate solid angle subtended by a finite plane bounded by straight lines

How to calculate solid angle (in Ste-radian) subtended by a plane bounded by the straight lines x=-8, x=12, y=-6 & y=20 in XY-plane at the point (8, -10, -6). Any help is highly appreciated. thanks ................... (Flower)(Flower)(Flower)
11. ### How to evaluate solid angle subtended by an ellipse at any point on the vertical axis

How to evaluate solid angle subtended by an ellipse at any point on the vertical axis passing through its center, I have made some calculations for this that is shown by the image attached
12. ### calculate an angle

Hi all, I need to find the angle of 9,51°, if we know: the lengths of 9,941 mm and 20,783 mm and the angle of 21,13°. The point with the anchor is fixed and the distance between it and the other point are known: in X 9,2mm, in Y 7,5 mm (as you can see on the sketch right here below). Thanks...
13. ### Suppose a triangle has sides a, b, and c, and the angle opposite the side of length..

Suppose a triangle has sides a, b, and c, and the angle opposite the side of length b is obtuse. What must be true? Please explain answer. Thank you!
14. ### In order to apply the law of cosines to find the measure of an interior angle...

In order to apply the law of cosines to find the measure of an interior angle, it is enough to know which of the following? A. The area of the triangle B. The length of all three sides of a triangle C. At least two of the angles of a triangle and the length of one of its sides Please...
15. ### Double Angle Identity with tan()

Hello, I am trying to do this problem, but cannot figure out how to do this with tangent. Thanks in advance!
16. ### Trisecting an angle using origami.

Hi. I have found many videos and PDFs that explain the procedure for trisecting an angle using origami. I understand the sequence of folds and how to do this. However, what I can't seem to find is any explanation of why this works, or what the reasoning was used to discover this method...