To determine the correct decomposition into triangles of the pentagonal school crossing signs in Figures A and B, we need to analyze how each figure is structured.
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Figure A has a line connecting vertices B and D and a vertical line from vertex C to the base (side AE). This decomposition creates three triangles:
- Triangle ABE
- Triangle BCD
- Triangle CDE
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Figure B connects the vertices A and C, B and D, and C and E. This leads to a decomposition that also forms triangles:
- Triangle ABC
- Triangle BCD
- Triangle CDE
Based on this analysis, both figures decompose into triangles.
Therefore, the answer would be 3 for both Figure A and Figure B.