Mathematics
Senior High
Resolved
どこを間違えているか教えてほしいです🥲
10.A=105,C=30°のときB,C,
A 105°
(35
Co
b
C
dc 30°
€
COSB
Cos C
B
0
B-45
10
CO545
C
COS300
45
1052
10√6
=
516=
20
3
2c
CA
11. (1) A+B+C = 180° であるから
B=180°−(105° + 30° = 45°
正弦定理により
b
C
,
sin B
sin C
b
sin B
=
=2R
10
C
ゆえに
...
①,
sin 45°
sin 30°
10
=2R
sin 45°
10sin 30°
①から
C=
=10
÷
sin 45°
10.1/+12=5√/2
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