, ,
. .
.
. . .
(.2.21) : , ; .
: ; .
. 2.24.
180 , ..
+ + = 180;
= 180 ( + )
= 30-00 ( + ).
: .
/sin C = / sin B = / sin A.
, /sin C .
:
/sin C = / sin B / sin = BC/ sin A,
= /sin C . sin = /sin C . Sin , (2.14)
= . cosec C . Sin B = . cosin C . sin A.
, , :
-
. cosec C;
- () , .
(, ..).
(2.14) :
lg = lg - lg sin B;
lg = lg lg sin C + lg sin A
lg = lg + lgcosec C + lg sin B;
lg = lg + lgcosec C + lg sin A.
2.11 (.2.21)
ABC :
- A = 34, B = 45;
- () = 302 .
( ), , .
= 180 ( + ) = 180 (34 + 45) = 180 79 = 101.
= . sinB / sinC = 3027(sin34 / sin101) = 172 ;
= . sinA / sinC = 3027(sin45o/ sin101) = 217,5 .
i.
. , , .
1: 25000, 1:50000 1:100000 5, 10 20 , , 2,5; 5 10 .
|
|
, , , .
(. 2.25) , - . , - d.
. 2.25.
= + h,
h .
h
H = d . tg .
, :
- (, ) , ;
- , , ;
- d.
.
2.12 (. 2.22)
:
- = 890 ;
- = + 830';
- d = 1250 .
.
h = d . tg = 1250 . tg830' = 1250 . 0,1495 = + 187 .
= + h = 890 + 187 = 1077 .
2.13 (. 2.22)
:
- = 500 ;
- = 730'; d = 900 .
.
h = d . tg = 900 . tg730' = +117.
= + h = 500 +117= 617.
.
.
. .