Question

Riki cuts two decagons out of cardboard.Then he glues yarn around theedges. How much yard does riki use if each edge of the decagon is 8 centimeter?

Answer 1

0.00736 Sq. Yard size of decagon is used

Explanation:

Given

Each side of Decagon
`= 8` centimeter

Area of Decagon

`A = (5)/(2) a \sqrt{5+2√(5) }`

Here a is the side of decagon

Substituting the given values, we get -

`A = 2.5 * 8 * 3.077\\A = 61.54`Square centimeter

1 square centimeter = 0.000119599 square yard

Area in yard = 0.00736 Sq. Yard