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Margaret [11]
3 years ago
12

Unghiurile ∢AOB și ∢BOC sunt adiacente suplementare, iar OM, respectiv ON, sunt bisectoarele acestora. Fie BD ⊥ OM, D ∈ OM și BE

⊥ ON, E ∈ ON . Demonstrați că: a) patrulaterul BDOE este dreptunghi. b) OB ≡ DE .
Mathematics
1 answer:
disa [49]3 years ago
5 0

Answer:

Following are the solution to this question:

Step-by-step explanation:

\angle AOB + \angle  BOC = 180\\\\\angle  MON = (\angle AOB + \angle BOC): 2 \\\\

            = 180: 2 \\\\=\frac{180}{2}\\\\= 90^{\circ}

In point a:

\angle AOB = 60\\\\ \angle BOC = 120\\\\ \angle MON = (60 + 120): 2 \\\\

            = 180: 2 \\\\=\frac{180}{2}\\\\= 90^{\circ}

In point b:

\angle BOC = 100\\\\\angle  AOB = 80\\\\ \angle MON = (100 + 80): 2

            = 180: 2 \\\\=\frac{180}{2}\\\\= 90^{\circ}

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