Why is it useful for historians to base certain studies on the analysis of historians periods

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Select the correct answer from each drop-down menu. this map shows how climate change might affect precipitation patterns in the great plains of the united states by the end of this century. brown shows a decrease in precipitation, and blue shows an increase. the maps differ based on the predicted levels of greenhouse gas emissions. the maps show that northern areas should get . southern areas will likely get . to use these maps to prepare for natural disasters in the great plains, scientists need to ask, ?

Which us migration trend began soon after world war ii? moving to cities moving to the suburbs moving to the sun belt moving to the northeast