Two of the angles of triangle ABC are given as x° and y°
Give an expression for the size of the external angle at C
That is: the angle between CB and the dotted line
Correct! Just add the other two angles to find the external angle at the third corner!
If you used to solve this type of question with a two-step method
Why not practise solving such questions with this one-step method? Exterior angle of a triangle (with numbers)
That isn't one of the expressions I've been programmed with.
Just tell me what to do with x and y -- in algebra not English!
This can be done with just three characters!
(You don't need to use an equals, you are not asked for a formula)
Can you find the size of the external angle when the question is asked with numbers?
(That is: without algebra)
If you can, then maybe you need help with forming and simplifying algebraic expressions.
(That part of the site is still under construction)