Hệ thức lượng 10
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•
Mathematics
•
10th Grade
•
Hard
light Moon
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4 Slides • 0 Questions
1
Định lý cosin
Cos α = Tổng bình phương hai cạnh kề trừ bình phương cạnh đối diện chia hai cạnh kề
Cos B= a2 + c2 -b2∕ 2ac
B
A
C
a
b
c
2
S=½ h.a
S= tích hai cạnh kề nhân sin góc giữa : S=½ b.c.sin A=½ a.c.sin B=½ b.a.sin C
S= a.b.c/4R
S=P.r
S=√P.(p-a).(p-b).(p-c) Dùng khi biết 3 cạnh của tg
P= a+b+c/2
3
Sin Bù
Sin(180⁰-α)=sinα
Cos(180⁰-α)= -cosα
Tan(180⁰-a)= -tanα
Phù chéo
4
α là góc tù chỉ có mình sin dương, còn lại âm
Định lý cosin
Cos α = Tổng bình phương hai cạnh kề trừ bình phương cạnh đối diện chia hai cạnh kề
Cos B= a2 + c2 -b2∕ 2ac
B
A
C
a
b
c
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