37 sides
Pentagons have 5 sides if that's any help..
10c5
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 quadrilateral has four sides and a pentagon has five. So 2 quadrilaterals and 3 pentagons have 2x4 +3x5 sides = 8 + 15 = 23 sides altogether.
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.
500
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.
The Pentagon
Pentagons (including convex pentagons) have five sides. (The prefix penta- is greek for 5)
heptagons have 7 sides pentagons have 5 sides therefore 4 x 7 = 28 4 x 5 = 20 Total 48 sides.
A hexagon has six sides, and a nonagon has nine. Three hexagons and three nonagons then have (3 x 6) + (3 x 9) = 18 + 27 = 45 sides altogether.
They are plane faces which can have from 3 to 5 sides (triangles, quadrilaterals and pentagons)..
Pentagons have 5 sides if that's any help..