A triangle is 20 cm by 15cm and 8cm what is the area fo he triangle

Answer erosion,oil spills,pollution,tourism,urban development;

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!