SAT MATH Program, Arcs, Sectors, Circles

SATMATH TI84 SAT Program Circles

First you’ll notice that from the SAT MATH main menus, you can select to solve Arc Length given radians, arc length given degrees, area of a sector given radians, area of a sector given degrees and an equation of a circle.

Starting with arc length in radians, you’ll notice that you needn’t enter the pi value. So, instead of entering your angle as 2(pi)/3, you can enter ⅔. You’ll see the message every time you use this submenu, so don’t worry. Next, you’ll enter the radius. The answer will be shown with the proper units.

Next, solving arc length in degrees, the input is easier. You just enter the theta in degrees and then your radius.

Going back to radians, you can solve for the area of a sector. Again, just as with the first option of arc length in radians, you can just enter your angle as 1 rather than 1 pi. Then, entering the radius of your circle, your program will give you the area of the sector with the proper units.

For area of a sector, you can enter the degrees of theta and the radius. Just as in the area of a sector in radian measure, your output will be in the proper units.

The next submenu option, Equation of a Circle, will give you lots of options. You can enter your circle in general form, center and radius, center and poin on the circle, or diameter endpoints. So long as the circle is possible, you’ll see your output in (x-h)^2 + (y-k)^2 = r^2 form.

By Martin

Martin McSweeney is a National Merit Finalist, Pomona College Graduate, and member of MENSA. He has worked at the Center for Talented Youth (Loyola Marymount University campus); Upward Bound (Harvey Mudd campus); various test prep companies; and Whittier High School. Now, Martin helps students of all abilities improve their relationship with math.