Question

help

Answer 1

have you covered the so-called "special triangles" of 30-60-90 yet?

what is the sum of all internal angles in a triangle anyway?
notice you're given \(\cfrac{\pi}{3}\) and notice the "perpendicular segments"
that means that angle is 90 degrees or \(\cfrac{\pi}{2}\)

Answer 2

I know angle A is pi/6=60 degrees, but I don't know how to find length of a and b

Answer 3

I mean pi/6 = 30degrees

Answer 4

well... you're right A is \(\cfrac{\pi}{6}\)

well.. so we have \(\begin{cases}
\cfrac{\pi}{3}\to 60^o\\
\cfrac{\pi}{2}\to 90^o\\\
\cfrac{\pi}{6}\to 30^o
\end{cases}\implies 30-60-90 \ rule\)

notice the 30-60-90 rule -> http://www.gradeamathhelp.com/image-files/30-60-90-triangle.jpg notice the ratios

keep in mind that we know that c = 9 or

Answer 5

so if you solve 9 = 2x for "x"
then you can pretty much tell the other sides

Answer 6

wow, you're right. My math teacher didn't talk about "special triangles" of 30-60-90" in class