trig
posted by Abigail on .
Please answer b)only
a) If a triangle has angles of 35 and 65 degrees, what is the measurment of the third angle? Is it a right triangle?
b)Find all angles of a right triangle triangle RST given that r = 18 cm and s = 20 cm

see my reply below in
http://www.jiskha.com/display.cgi?id=1208400886 
yes, the sum of angles is 180 in triangle.
b. you know the third side (PYTH theorm). You can find angles from sin, cosine.