lines and angles introduction
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Answer:
January – British bacteriologist Frederick Griffith reports the results of Griffith's experiment, indirectly proving the existence of DNA.[1][2]
January 1
Estonia changes its currency from the mark to the kroon.[3]
Abolition of domestic slavery in the British Protectorate of Sierra Leone comes into effect.[4]
Eastern Bloc emigration and defection: Boris Bazhanov, Joseph Stalin's personal secretary, crosses the border to Iran to defect from the Soviet Union.[5]
January 6–7 – The River Thames floods in London; 14 people drown.[6] On January 7, the moat at the Tower of London (drained in 1843 and planted with grass) is completely refilled by the river.
January 17 – The OGPU arrests Leon Trotsky in Moscow; he assumes a status of passive resistance and is exiled with his family.[7]
January 26 – The volcanic island Anak Krakatau appears.[8][9]
February
Step-by-step explanation:
Events Edit
January Edit
Main article: January 1931
January 2 – South Dakota native Ernest Lawrence invents the cyclotron, used to accelerate particles to study nuclear physics.
January 3 – Albert Einstein begins doing research at the California Institute of Technology, along with astronomer Edwin Hubble.
January 4 – German pilot Elly Beinhorn begins her flight to Africa.
January 6
Thomas Edison submits his last patent application.
In Chicago, CBMC hosts the first meeting to address a greater purpose for business during The Great Depression; over 800 people attend the meeting, in Chicago's Garrick Theatre.[1]
January 10 – The National Committee for Modification of the Volstead Act is formed, to work for the repeal of Prohibition in the United States.[2]
January 22 – Sir Isaac Isaacs is sworn in as the first Australian-born Governor-General of Australia.
January 25 – Mohandas Gandhi is again released from imprisonment in India.[3]
January 27 – Pierre Laval forms a government in France.
January 30 – The movie City Lights, starring Charlie Chaplin, is released.
The All-Asian Women's Conference (AAWC) takes place in Lahore.
February Edit
Main article: February 1931
February 3 – Hawke's Bay earthquake: Much of the New Zealand cities of Napier and Hastings are destroyed in an earthquake measuring 7.9 on the Richter scale, killing 256 people.
February 4 – Soviet leader Joseph Stalin gives a speech calling for rapid industrialization, arguing that only strong industrialized countries will win wars, while "weak" nations are "beaten". Stalin states: "We are fifty or a hundred years behind the advanced countries. We must make good this distance in ten years. Either we do it, or they will crush us." The first five-year plan in the Soviet Union is intensified, for the industrialization and collectivization of agriculture.
February 10 – Official inauguration ceremonies for New Delhi as the capital of India begin.[4]
February 11 – National Socialist (NSDAP) and German National People's Party (DNVP) members walk out of the German Reichstag, in protest against changes in the parliament's protocol, intended to limit heckling.
February 12 – Vatican Radio first broadcasts.
February 14 – The original film version of Dracula, with Bela Lugosi, is released in the United States.
February 16 – Pehr Evind Svinhufvud is elected president of Finland.
February 20 – California gets the go-ahead by the United States Congress, to build the San Francisco–Oakland Bay Bridge.
February 21 – Peruvian revolutionaries hijack a Ford Trimotor aeroplane, and demand that the pilot drop propaganda leaflets over Lima.
Answer:
A line is a one-dimensional figure, with no breadth, and that extends in both directions infinitely. These are the lines with one end as the start point and the other end going to infinity. These are used to form angles. Angles are formed when two rays intersect at a point.