<p>Does anyone have any advice on solving the trig problems on the ACT?
Also, can anyone explain the rules for inscribed angles and sectors in a circle? Thanks and good luck</p>
<p>umm… the trig problems are quite simple if u finished a class greater than pre-calc. What class r u going into next year and with what type of questions do u need help with (i.e. simpler questions or the more complex ones) ?
As for sectors, they are the part of the circle created by an arc and 2 radius. In order to find the area of a sector, multiply the degree of the sector over 360 and the normal area of the circle.
As for incribed angles, what exactly are u asking? Are u talking about a circle and how there are two chords that create a angle? If so, then the that angle is equal to the degree of the arc.
Not sure if any of that helped… so let me know if u need more help! Good luck!</p>
<p>VT2015,</p>
<p>Know the trigonometric functions: sin(), cos(), tan(), and their cofunctions: csc(), sec(), and cot(), respectively.</p>
<p>Know the law of cosines: c^2 = a^2 + b^2 * (2<em>a</em>b*cos(C))
Know the law of sines: (sin A / a) = (sin B / b) = (sin C / c)</p>
<p>Know when to use the inverse trigonometric functions: sin^-1() and etc.
Know how to find the inverse trigonometric function of a cofunction: csc^-1 = sin^-1(n^-1)</p>
<p>Always follow the domain rules set for a problem.</p>
<p>For example, find sin^-1(.5) if 90 < X < 180
A. 30 degrees
B. 60 degrees
C. 120 degrees
D. 150 degrees</p>
<p>You may be tempted to pick A(30) if you did not see the domain restriction. The answer is D because sin(150 degrees)=.5. sin^-1(.5)=30, but 30 is not in between 90-180, so the answer is incorrect.</p>