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Earn +20 ptsQ: How many sides does a dodecagons?
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How many sides do 2 dodecagons and 4 quadrilaterals have altogether?
A dodecagon has 12 sides, and a quadrilateral has 4. So in 2 dodecagons and 4 quadrilaterals there are 2*12 + 4*4 = 24 + 16 = 40 sides altogether.
How many sides do 5 dodecagons and 4 pentagons have altogether?
A dodecagon has 12 sides, and a pentagon has 5 sides. So 5 dodecagons have 5*12 = 60 sides, and 4 pentagons have 4 * 5 = 20 sides, for a total of 60 + 20 = 80 sides.
How many sides do 3 dodecagons and 1 heptagon have altogether?
3*12 + 1*7 = 36+7 = 43 sides.
How many sides do 4 decagons 3 dodecagons 1 nonagon and 3 triangles have altogether?
1*9 + 3*3 + 4*10 + 3*12 = 9 + 9 + 40 + 34 = 92
Can equilateral dodecagons that are not regular tessellate?
Yes. For example if you have a decagon in which the top, bottom and the four sides on the left are as in a regular decagon, and if the four sides on the right make the shape concave. These decagons will "slot" into one another.
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