iran-konkur 2018 Q132

iran-konkur · Other · konkur-riazi_1397_specialized Not Maths
132- Triangle $ABC$ is isosceles with $AB = AC$. Point $P$ is on face $P$ and point $M$ is outside face $P$, such that $MB = MC$ and $MA \perp AB$. Which of the following conclusions is incorrect?
(1) $MB \perp BC$ (2) $MA \perp AC$ (3) $MA \perp P$ (4) $MA \perp BC$
\textbf{132-} Triangle $ABC$ is isosceles with $AB = AC$. Point $P$ is on face $P$ and point $M$ is outside face $P$, such that $MB = MC$ and $MA \perp AB$. Which of the following conclusions is \underline{incorrect}?

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(1) $MB \perp BC$ \hfill (2) $MA \perp AC$ \hfill (3) $MA \perp P$ \hfill (4) $MA \perp BC$

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