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Alex17521 [72]
3 years ago
14

Three planes that intersect in one line

Mathematics
1 answer:
guapka [62]3 years ago
5 0
They are collinear points and are called planes. 
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Step-by-step explanation:

b=9

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Area of =(bxcxsinA)/2

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Area of =(9x7x0.8910)/2

Area of =(56.133)/2

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