Question

In varful A a patratului ABCD se ridica, pe planul acestuia perpendiculara AM. determinati:
a) pr(ABC)M
b) pr(ABM)C
c) pr (ADM)A
d) pr(ABC) [MD]
e) pr(MAD)[CM]
f) pr (ABC)[MC]

Urgență!!!

Answer 1

$a) pr_{(ABC)} M=A$

MA⊥AB , iar AB ⊂ (ABC)

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$b) pr_{(ABM)} C=B$

CB⊥AB, iar AB ⊂ (ABM)

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$c) pr_{(ADM)} A=A$

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$d) pr_{(ABC)} [MD]=[AD]$

$pr_{(ABC)}M=A \\pr_{(ABC)} D=D$

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$e) pr_{(MAD)} [CM]=[DM]$

$pr_{(MAD)} C=D\\pr_{(MAD)} M=M$

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$f) pr_{(ABC)} [MC]=[AC]$

$pr_{(ABC)}M=A\\pr_{(ABC)}C=C$