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5.1
Understanding Geometry
Additional Example 1
Additional Example 2
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Additional Example 1
In the figure,
(a) how many straight lines
are there?
Solution
(b) how many line segments are there?
Solution
(c) write down the names of all the straight
lines and line segments.
Solution
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2
Additional Example 1
In the figure,
(a) how many straight lines are there?
(b) how many line segments are there?
(c) write down the names of all the straight
lines and line segments.
Solution
(a)
2 straight lines
Q1(b)
(b)
4 line segments
Q1(c)
(c)
Straight lines: PQ, PY
Line segments: PQ, PX, PY, XY
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3
Additional Example 2
The figure shows a pattern formed by a tangram.
Classify the marked angles and complete the
following table.
Angle
Name
Acute angle
Right angle
Obtuse angle
Straight angle
Reflex angle
Solution
Round angle
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4
Additional Example 2
The figure shows a pattern
formed by a tangram. Classify
the marked angles and
complete the following table.
Solution
Angle
Name
Acute angle
f, j
Right angle
a, d
Obtuse angle
b, i
Straight angle
h
Reflex angle
c, g
Round angle
e
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5