BRAIN TEASERS

enter your answer and press button OK

Find the area of the shaded figure

Express result to the accuracy of 3 decimal.

Correct answers: 51

The first user who solved this task is Djordje Timotijevic.

#brainteasers #math

Register with your Google Account and start collecting points.

Check your ranking on list.

Imagine that

Can u believe what people do in the church these days?

I was in the church listening tothe priest's sermon when i saw a guy smoking cigarettes inside the church.

I was so amazed that i didn't know when the bottle of beer i was holding fell on the floor.

Jokes of the day - Daily updated jokes. New jokes every day.

Follow Brain Teasers on social networks

Brain Teasers

puzzles, riddles, mathematical problems, mastermind, cinemania...

Photophone

In 1880, Alexander Graham Bell transmitted the first wireless telephone message on his newly-invented photophone. The photophone worked by projecting his voice through an instrument towards a mirror. The vibrations in the voice caused similar vibrations in the mirror. Bell directed sunlight into the mirror, which captured and projected the mirror's vibrations. The vibrations could be deconstructed back into sound at the receiving end of the projection. In this way the photophone functioned similarly to the telephone; the difference was that the photophone used light as a means for projecting the information, while the telephone used electricity.

This site uses cookies to store information on your computer. Some are essential to help the site properly. Others give us insight into how the site is used and help us to optimize the user experience. See our privacy policy.