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## Wednesday, August 10, 2011

### CIRCLE AND ITS RELATED TERMS

Circle is the set of all points in a plane that are equidistant from a given point in the plane known as the center of the circle.

Chord -
is a segment whose endpoints lie on a circle

Secant -
is a line that intersects the circle at two points

Diameter is the longest secant in a circle.

Tangent - is a line in the plane of the circle that intersects the circle at exactly one point
Sector -The part of a circle enclosed by two radii  of a circle and an arc.
The cut piece of pizza is minor sector and the remaining is the major sector.

Segment -part of a circle bounded by a chord and an arc

Semi-circle -
is an arc whose endpoints are endpoints of a diameter

## Tuesday, August 9, 2011

### Applications of Trigonometry in Real life

• Trigonometry is commonly used in finding the height of towers and mountains.

• It is used in navigation to find the distance of the shore from a point in the sea.

• It is used in oceanography in calculating the height of tides in oceans

• It is used in finding the distance between celestial bodies

• The sine and cosine functions are fundamental to the theory of periodic functions such as those that describe sound and light waves.

• Architects use trigonometry  to calculate structural load, roof slopes, ground surfaces and many other aspects, including sun shading and light angles