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Basic Geometry: Angles and Parallel Lines
Time:2008/3/19 22:25:22,Hit rate:0

The Sum of Three Angles of a Triangle


Move the triangle by dragging the red point.

What did you find?
 

 

The Sum of Outer Angles of a Polygon

What is the sum of the angles?

 Instructions

  1. Click some points to make a polygon.
  2. Press "Ok" button to close the polygon.
  3. Press "Scale down" button.
  4. What do you find?

Problem of Angles and Parallel Lines

problem 1

In the right figure,l is parallel to m.
(1)When the angle a=30degrees,b=45degrees,find the angle APB.
(2)When the point P is between the line l and m,find the expression for the angle APB using a and b.
(3)When the point P is above the line l,find the expression for the angle APB using a and b.

Problem 2

In the right figure, ,
angle APR=RPQ and PQR=RQC.

What do you find about the angle PRQ?
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