The net drawn for the solid shown below is incorrect.

(a)
Name the solid.

Ans: (a)___
(b)
Shade a triangular face on the net that does not fit the net of the solid.

Recognising triangles and quadrilaterals Classifying quadrilaterals 中文

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Worked solution

23(a)

1. Identify the solid based on its faces and shape.

The solid has a triangular base and three triangular faces meeting at an apex. This defines a triangular pyramid.

Answer

Triangular pyramid

23(b)

1. Identify the solid and its required faces

The solid is a square-based pyramid. It requires 1 square base and 4 triangular faces.

2. Analyse the given net by mental folding

The given net has 1 square and 5 triangles. A square-based pyramid only needs 4 triangles. When folding the net, the three triangles attached to the same side of the square will overlap. Therefore, one of these three triangles is extra and does not fit.

Answer

Shade any one of the three triangles attached to the same side of the square.

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The net drawn for the solid shown below is incorrect.

Worked solution

23(a)

23(b)

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