It's a good idea to make sure that you understand every word in the problem you're trying to solve. If you're not certain about an unfamiliar word,

The sum of three consecutive numbers is...

Twice the complement of an angle is 
40 degrees less than...

The orthocenter of a triangle lies at
the intersection of...

If ABCD is a cyclic quadrilateral and...
then look it up -- in a dictionary, or the glossary of your textbook, or here.