tan A should be the corner try work out work out:

first and then add all the others (B=90)
Explanation:
A and C should be the same
Answer:
Shifting cultivation is an agricultural system in which a person uses a piece of land, only to abandon or alter the initial use a short time later. This system often involves clearing of a piece of land followed by several years of wood harvesting or farming until the soil loses fertility.
An advantage is that it takes way less time to do it than to create a formal treaty since the President would not need consent from the congress for an executive agreement. A formal treaty can, however, last longer because it is more difficult to cancel, so if it's good, then it is also safer for it to be formal.
Answer:
In 1900, what became known as the Boxer Rebellion, a Chinese secret organization called the Society of the Righteous and Harmonious Fists led an uprising in northern China against the spread of Western and Japanese influence there. The rebels, referred to by Westerners as Boxers because they performed physical exercises they believed would make them able to withstand bullets, killed foreigners and Chinese Christians and destroyed foreign property. From June to August, the Boxers besieged the foreign district of Beijing, China’s capital, until an international force that included American troops subdued the uprising. By the terms of the Boxer Protocol, which officially ended the rebellion in 1901, China agreed to pay more than $330 million in reparations.
Explanation:
Answer:
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