Sorry, write out a hundered lines:
"An equalatral triangle is not the same as a right angle triangle (The 3 angles in non right angle triangles do not add up to 180 degrees). Drop a perpendicular so you have two right angled triangles, then you have:
40 + 90 = 130.
180 - 130 = 50.
2 x 50 = 100 degrees
Therfore x = 100 degrees."
However you were spot on re the lengths a and b
Having said that now someones going to prove me wrong & embarass me.
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