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< Gymnasium Stein‎ | Mathe‎ | Klasse 10‎ | Bogenmaß‎ | Aufgabe 8
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## Figures of circular arcs

 Task Three equally big coins are lying on a table in a way that each one is touching the two others. Calculate the perimeter U and the surface area A of the figure between the three coins as a function of the coins' radius.

bitte warten

bitte warten

 Note Click inside the bright gray box. It turns turquoise. Enter your solution. You may also use the menu, which is available via rightclick. Complete your input with the RETURN-key. Green: right. Orange: wrong See also: Using the Formel-Applet
 Solution $U=$   r*π    (Select the red area to see the solution) $A=$  (r^2)*sqrt(3)-0,5*r^2*π    (Select the red area to see the solution)