From some law of mathemeatics, in a right triangle with angles measuring 45-45-90, the measure of the hypotenuse is { l } \ sqrt { 2 }, where " l " is the length of either leg ( not the hypotenuse ).
42.
Any sailor worth his salt can gauge his latitude well enough by the length of the day or ( using an angle measuring instrument frequently called a sextant today ) by the height of the sun or known guide stars above the horizon,
43.
In addition, Lambert postulated a surface that emits light ( either as a source or by reflection ) in a way such that the density of emitted light ( luminous intensity ) varies as the cosine of the angle measured from the surface perpendicular.
44.
:The local hour angle is the angle measured westward from the meridian ( that is, the projection of the line of longitude the observer is standing on onto the celestial sphere ) to the hour circle of the celestial object, measured westward along the celestial equator.
45.
Now let \ mathbf { C } ( t ) = ( r ( t ), \ theta ( t ), \ phi ( t ) ) be a curve expressed in spherical coordinates where \ theta is the polar angle measured from the positive z-axis and \ phi is the azimuthal angle.
46.
There is little consistency in labeling gap wedges; most manufacturers simply label the wedge with its angle, optionally including additional information about the amount of bounce ( sometimes the angle measure, more often a series of one to three dots indicating " low ", " medium " and " high " bounce ).
47.
The parameters are often the x and y coordinates of the origin of a coordinate frame in M measured from the origin of a coordinate frame in F, and the angle measured from the x-axis in F to the x-axis in M . This is often described saying a body in the plane has three degrees-of-freedom.
48.
With each \ theta as the angle measured from the normal of the boundary, v as the velocity of light in the respective medium ( SI units are meters per second, or m / s ), \ lambda as the wavelength of light in the respective medium and n as the refractive index ( which is unitless ) of the respective medium.
