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25
Ex. Obtain a s ide
a
=J b'+ c'
2bccosO
b= 456,
c
=
123,
8
=
78·
Ex.
Calculate
area
of
equi late
r
al
pentagon
(radius: 10
)
nr'
211'
S (areu
)=
-sin-
2
"
r:
r
adius ............
···· ..
l
O
n :
numbel'
of
si
de ..
·
..
5
~cIDo@]
2
0~El
5
G
~
0
5
(8)
1
0~8
2
El
_
r l
~
23
=
7.~ 7-
. .
~
,2-~
or@]
5
~
2
B
2
(8)lliJ
2
(8)0(±]
5
@ l I ! ! l E l -
; : : 1
:"- 23=
7.
= 7-
"
-
'2-~
.
,
@]
5
j!l
2
8
2
El
e!
2
008
~--~
5
ElI!!l0
(!jJ
El
-I
~37
.
76412
Obta in a needful length of t
he
simple cable
stretched be
tween t
wo
poles
of the
same
heigh
t.
X :
Interval be
t ween
t
wo
'
'''--j,
--;",
poles
50(m)
,
'-----"
2T
.
WX
L
=
w s
lnh 2f
(m)
W :
Weight
of
cable
O.78(kg/ m)
T :
Hor
izonta
l tension at
the lowest point
62
(kg)
@]@6@[::J780@)[::J 780 508
62
8 2@1
i!l~0
-
.
1
50.
828376
Ex.
Obtai
n
the
sum
of A and
B
A"'4
hours
56
minutes 23
seconds
B···5
hours
43
minutes
38
seconds
~6@]
4
85623
~
EJ
5
[::J'338~
0
•
I
4.
9397222
-
I
10.
666944
I!!lIOl
-I
10.
'000
So
10
hours
40 minu
tes
and about
0
second
is
obta
ined.
26
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