Frage 91

A square-based pyramid has a square base and four triangular faces that meet at a single point above it. Select all the statements that are true about this solid.

It has 5 vertices: the four corners of the base together with the point where the triangles meet.Richtige Antwort
It has only 4 vertices, one for each corner of its square base.
It has 5 faces in total, one square and four triangles.Richtige Antwort
It has 8 vertices, one for each of its edges.

Erklärung

Counting corner points means counting every place where edges meet, and the point above the base is such a place just as the four base corners are. Stopping at 4 counts only the corners resting on the ground and leaves out the very point that makes the solid a pyramid.

Erklärung

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