Question

5. Find the shortest and longest line segments in
Figures 4a and 4b with the help of
a divider.
Р
R
0
B
C С
S
Fig. 4a
Fig. 4b​

Answer 1

Step-by-step explanation:

Given P is equidistant from points A and B

PA=PB .....(1)

and Q is equidistant from points A and B

QA=QB .....(2)

In △PAQ and △PBQ

AP=BP from (1)

AQ=BQ from (2)

PQ=PQ (common)

So, △PAQ≅△PBQ (SSS congruence)

Hence ∠APQ=∠BPQ by CPCT

In △PAC and △PBC

AP=BP from (1)

∠APC=∠BPC from (3)

PC=PC (common)

△PAC≅△PBC (SAS congruence)

∴AC=BC by CPCT

and ∠ACP=∠BCP by CPCT ....(4)

Since, AB is a line segment,

∠ACP+∠BCP=180

∘

(linear pair)

∠ACP+∠ACP=180

∘

from (4)

2∠ACP=180

∘

∠ACP=

2

180

∘

=90

∘

Thus, AC=BC and ∠ACP=∠BCP=90

∘

∴,PQ is perpendicular bisector of AB.

Hence proved.