Which of the numbered stones shown cannot be mapped to another with a rigid motion?
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let's recall that corresponding angles are equal, thus 105° twins, also let's recall that a flat-line has 180°.
since the two sides stemming from Ɣ are twins, the angles they make at the base are also twins, bearing in mind that a triangle has a sum of all interior angles of 180°.
Hello, Marymack!
We know that in a geometric sequence defined by
and 
, the sum can be calculated the following way:
We know that in a geometric sequence defined by