định lý cosin, sin
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29 Terms
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h²
b’c’
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SinB
CosC=c/a
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CosB
SinC=b/a
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a²
b²+c²-2bccosA
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Diện tích tam giác bất kì
½ đáy.cao= ½ ah(a)= ½ bh(b)= ½ ch©
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Diện tích tam giác
½ abSinC= ½ bcSinA= ½ acSinB
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Diện tích hbh
Đáy.cao
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Diện tích hình thoi
m.n/2
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Thể tích hình, a=b
V=a³√2/12
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Tam giác vuông
Cạnh đối với góc 60 sẽ bằng cạnh kề nhân √3