# A triangular piece of paper measures 8cm, 12cm, and 15cm. what is the perimeter of the piece of paper?

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35 cm

Posted on Aug 05, 2010

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Posted on Jan 02, 2017

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Hello

OK, the formula for the Area of a triangle is A=0.5xBasexHight. For this formula to be applicable you will need to have a 90 degree angle in this triangle.

For example:

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A = 0.5x8x15

Let me know if you need any further assistance.

Kind regards
Andrea

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display is disclosed which produces multiple visual displays in an intermittent manner which includes a display housing having a perimeter wall which is transparent during visual display and is an opaque mirror between visual displays. The perimeter wall of the display housing is a composite structure which preferably includes a transparent cylindrical substrate which is coated with an optical film and an opaque mask which defines display windows. Multiple visual displays are produced by a rotating display base which carries rows of rotating display elements. Preferably, the display elements are elongated triangular elements having three image faces which bear images which create the visual displays. The triangular display elements are arranged in a triangular configuration wherein the rows intersect one another at acute angles and are carried by the rotating base. The rotating base includes three display positions and each of the triangular elements includes three display positions. A stationary observer would see nine different visual displays and may see themselves mirrored in between and during the changes of visual displays. The perimeter wall of the display housing becomes transparent as the triangular display elements are backlit along their entire length by elongated fluorescent or neon light tubes. When the light tubes are off, the cylindrical display housing is an opaque mirror, preferably, about its entire periphery and height. Other embodiments of the invention include a single row of triangular display elements, and a rotating display base which includes display faces consisting of only a single display element.

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