Question

cole found BC in triangle ABC his work shown below idenfity the first step in which shows an error

Answer 1

Answer:

Coal mining is the process of extracting coal from the ground. Coal is valued for its energy content and since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United Kingdom and South Africa, a coal mine and its structures are a colliery, a coal mine is a 'pit', and the above-ground structures are a 'pit head'. In Australia, "colliery" generally refers to an underground coal mine. In the United States, "colliery" has been used[when?] to describe a coal mine operation, but this usage is less common.