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Find the area of the shaded figure

Express result to the accuracy of 3 decimal.

Correct answers: 22

The first user who solved this task is Djordje Timotijevic.

#brainteasers #math

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'Dad,' a teenaged girl says...

"Dad," a teenaged girl says, running into her father's den, "I'd like to kiss you good-bye before I go to school!"
"You're too late, honey. Your mother just did that two minutes ago, and I don't have any cash left on me."

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Zoopraxiscope

In 1882, the zoopraxiscope, an optical apparatus invented by Eadweard J. Muybridge (1879) to exhibit photographs of moving animals, was shown at the Royal Institution in the presence of the Prince of Wales. Muybridge's great work on the subject was published in 1887-9, and his Animals in Motion in 1899.* The zoopraxiscope projected images from rotating glass disks in rapid succession to give the impression of motion. It functioned as essentially the first movie projector, with a sequence of stop-motion silhouette images hand-painted around the edge of a circular glass disk, which was loaded onto the projector's side in a vertical position. In 1893, he lectured at "Zoopraxigraphical Hall" at the World's Columbian Exposition in Chicago.«[Image: Zoopraxiscope light source with chimney (left), glass disc (bottom alone, and right of centre mounted vertically). A large lens mounted for focussing the light beam stands on the right outside the picture.]

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