Refer to the solid figures and nets shown.

(a)
Complete the net of the solid figure in the grid below.
(b)
The net of the solid figure has an extra face. Identify the extra face and put a cross (X) over it.

Recognising triangles and quadrilaterals Classifying quadrilaterals 中文

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Worked solution

28(b)

1. Identify the faces of the given solid figure.

The solid figure is a triangular pyramid (tetrahedron). It consists of exactly $4$ triangular faces and has no quadrilateral faces.

2. Identify the extra face in the proposed net.

The given net contains $4$ triangular faces and $1$ central quadrilateral face. Since the solid does not have any quadrilateral faces, the central quadrilateral is the extra face.

Answer

Cross (X) on the central quadrilateral face.

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Refer to the solid figures and nets shown.

Worked solution

28(b)

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