ACTIVITY
2
figure
3
one angle, as shown at the right.
Identify angle formed by the three adjacent angles?
What is its measure?
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Write about the sum of the measures of the angles of a triangle.
2.
Now let us prove this statement using the axioms and theorems related to parallel
lines.
• Draw and cut out a large triangle as shown in the
Number the angles and tear them off.
Place the three angles adjacent to each other to form
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Answer:
A line segment has two end points.
A ray has only one end point (its vertex).
A line has no end points on either side.
This chapter throws light on topics such as related angles, pair of lines. The chapter deals with different types of angles and lines. The types of angles discussed in this chapter are as follows:
Pairs of Angles Condition
Two complementary angles Measures add up to 90°
Two supplementary angles Measures add up to 180°
Two adjacent angles Have a common vertex and a common arm but no common interior
Linear pair Adjacent and supplementary
A linear pair is a pair of adjacent angles whose non-common sides are opposite rays.
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