Unit-8 Some Basic Concepts

In this unit you will learn about plane geometry.

Name two real-life situations where the concept of “angle” is used?

Give examples of objects that are slanted to the ground?

Check whether the following statements are postulates? Give reasons for your answer.

i) A line is collinear if and only if they lie on the same line.

ii) A plane is determined by three noncollinear points.

Looking around you, find out certain objects where you can mark acute, right an obtuse angles?

What is the dimension of a triangle?

Check whether the following statements are postulates? Give reasons for your answer.
i) A line is collinear if and only if they lie on the same line.
ii) A plane is determined by three noncollinear points.

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1 Answers

i) is not a postulate as it is the definition of collinear.

ii) is a postulate as it is the restatement of postulate 2.