37 sides
10c5
Pentagons have 5 sides if that's any help..
If the they are plain figures ( 2 - dimensional), then they are pentagons. Remember you Latin ; 'Penta' means five(5). Pentagons can be regular ( all sides the same length ) , or irregular ( the sides are of different lengths).
Dodecahedron
A pentagon has five sides, and a decagon has ten sides. So 3 pentagons and 5 decagons have (35)+(510) = 65 sides altogether
A quadrilateral has four sides and a pentagon has five. So 2 quadrilaterals and 3 pentagons have 2x4 +3x5 sides = 8 + 15 = 23 sides altogether.
They have 49 sides.
74 sides
There are 11 times 5 = 55 sides in 11 pentagons.
A pentagon has five sides, and a quadrilateral has four sides. So five pentagons and three quadrilaterals have 5*5 + 3*4 sides = 25 + 12 sides = 37 sides.
A pentagon has 5 sides. If you have 4 pentagons, you use: 4x5=20. Therefore, 4 seperate pentagons have 20 sides. This is not true if you have them combined however.
There are: (5*6)+(3*5)+(5*3) = 60 sides
500
20 :)
Altogether there are: (5*5)+(3*6)+(1*8) = 51 sides
A decagon has 10 sides, a dodecagon 12, and a pentagon 5. So 4 decagons, 5 dodecagons, and 3 pentagons have 4*10 + 5*12 + 3*5 sides = 40 + 60 + 15 = 115 sides altogether.