Question 491310
Use inverse trig functions on the calculator, or for exact values
use the two special angle right triangles:

{{{drawing(200,200,-.1,1.8,-.1,1.8,locate(.8,1.3,"30°"),
locate(.1,.17,"60°"), red(arc(0,0,.8,-.8,0,60),arc(1,sqrt(3),1.5,-1.5,240,270)),
locate(.5,0,1), locate(1.05,.9,sqrt(3)), locate(.3,.8,2),
rectangle(.9,0,1,.1),

triangle(0,0,1,0,1,sqrt(3)))}}}{{{drawing(200,200,-.1,1.8,-.1,1.8,
locate(.5,0,1),locate(1.05,.55,1), locate(.3,.6,sqrt(2)),
locate(.8,.8,"45°"), locate(.15,.17,"45°"), rectangle(.9,0,1,.1),

red(arc(0,0,.8,-.8,0,45),arc(1,1,.8,-.8,225,270)),



triangle(0,0,1,0,1,1))}}}

and of course you'll need these:

{{{matrix(3,1,

SINE=OPPOSITE/(HYPOTENUSE),
COSINE=ADJACENT/(HYPOTENUSE),
TANGENT=OPPOSITE/(ADJACENT)) }}}

Edwin</pre>