A regular pentagon may be divided into 5 congruent triangles.
If the side of the pentagon is 6 feet, each base of the triangles will be 6 feet.
If the distance from the center to a vertex is 6 feet, all the sides of the triangles will 6 feet.
So there are 5 congruent, equilateral triangles each with side equal to 6 feet.
The area one of those triangles is calculateb by:
base * height / 2
height ^2 = (side length) ^2 - (side length /2)^2 = 6^2 - 3^2 = 36 - 9 = 27
=> height = √(27) ≈ 5.2 feet
And, using area = base * height / 2 ,
area of a triangle = 6 feet * 5.2 feet / 2 = 15.6 feet^2
And the area of the entire pentagon equals 5 triangles ≈ 5 * 15.6 feet^2 = 78 feet^2
Answer: 78 feet^2
electric energy to heat and light energy
The one with 4 spoons of sugar has more density.
Answer:
Here's how I would do it.
Explanation:
A Lewis structure shows the valence electrons surrounding the atoms.
1. Identify the central atoms
The central atoms are the least electronegative atoms (C).
I chose as my central atoms a chain of four C atoms: C-C-C-C
I stuck the most electronegative atom (O) at the end of the chain:
C-C-C-C-O
2. Complete the structure
The hydrogen atoms must be terminal. Add enough to give every atom an octet.
You should get a structure like the one below
1) CH2 (gas) + Br (solid) -> BrC (solid) + H2 (gas)
2) a) CH4 + Br2 -> CH3Br + HBr
2) b) methane + bromine is substitution because one hydrogen atom from methane is replaced by one bromine atom. addition reaction takes place when one molecule combines with another to form a larger molecule so therefore a molecule from X and bromine combine to form XBr.
