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Find the length of red arc AB

Find the length of red arc AB (r1=1, r2=2). Express result to the accuracy of 3 decimal.

Correct answers: 43

The first user who solved this task is Roxana zavari.

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Dear Monday ... I want to break up

Dear Monday:

I want to break up.

I am seeing Tuesday and dreaming about Friday. Sorry.

It’s not me — it’s you

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First U.S. gasoline tractor sold

In 1892, the first gasoline tractor to be sold in the U.S. was shipped by its builder, John Froelich of Froelich, Iowa. It was sent to Langford, South Dakota, which lacked easy access to a wood or coal supply for steam-powered units. There, it spent a season threshing from 24 Sep to 16 Nov of the same year. His 16-horsepower machine was geared for both forward and reverse motion. It was powered by a Van Duzen vertical single-cylinder gasoline engine mounted on wooden beams upon a Robinson running gear. This both powered a J.I. Case threshing machine and propelled the vehicle. Froelich formed the Waterloo Gasoline Tractor Engine Company on 10 Jan 1893, which was was taken over in 1918 by the John Deere Plow Co.*

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