geometry select the best answer..?

Question

4.What is the area of a sector of a circle that has a diameter of 10 in. if the length of the arc is 10in.?
a)25sq in
b)50sq in.
c)75sq in.
d)100sq in.

17.what is the approximate area of a segment of a circle with a height 6m and the length of the chord is 20m? round your answer to the nearest whole number
a)8.54m2
b)73.6m2
c)85.4m2
d)746.67m2

18. what is the area of an ellipse with the major axis 20m and the minor 10m? round your answer to the nearest whole unmber
a)50m2
b)157m2
c)200m2
c)314m2

Answer 1

a, c, b

Is this part of a homework? I´ve already answered two of this problems for someone else.

See here for the procedure http://tinyurl.com/s8r2z

Actually if the answer of #17 is rounded to the nearest whole number it would be 85 so non of the choices would be right.

Answer 2

Seesaw molecules behave besides trigonal bipyramidal ones in that they circulate by using a element of Berry pseudorotation. The 4 atoms in action act as a lever with regards to the substantial atom; for example, the 4 fluorine atoms of sulfur tetrafluoride rotate around the sulfur atom. The molecular geometry might nicely be desperate via fairly some spectroscopic techniques and diffraction techniques. IR, microwave and Raman spectroscopy might provide information with regards to the molecule geometry from the information of the vibrational and rotational absorbances detected via those suggestions. X-ray crystallography, neutron diffraction and electron diffraction might provide molecular shape for crystalline solids based on the area between nuclei and concentration of electron density. gas electron diffraction might nicely be utilized for small molecules interior the gas section. NMR and complication techniques might nicely be utilized to ascertain complementary information which incorporate relative distances, [3][4][5] dihedral angles, [6] [7] angles, and connectivity. Molecular geometries are superb desperate at low temperature by way of fact at greater temperatures the molecular shape is averaged over greater available geometries (see next section). greater molecules often exist in different good geometries (conformational isomerism) that are close in capability on the aptitude capability floor. Geometries is additionally computed via ab initio quantum chemistry the thank you to severe accuracy. The molecular geometry might nicely be different as a great, in answer, and as a gas. the area of each atom is set via the character of the chemical bonds via which it relatively is hooked as much as its neighboring atoms. The molecular geometry might nicely be defined via the positions of those atoms in area, evoking bond lengths of two joined atoms, bond angles of three related atoms, and torsion angles (dihedral angles) of three consecutive bonds.

Answer 3

Pie = 3.14 Pie+ice-cream = Pie alamode b b a

Answer 4

a,b,b