Step: 1

In the figure, the base of the pyramid is a triangle.

Step: 2

So, it is a triangular pyramid with 3 base edges.

Step: 3

The faces of the pyramid joining the base edge to the vertex are the triangular faces of the pyramid.

Step: 4

So, there are 4 triangular faces in the pyramid.

Correct Answer is : 4

Step: 1

The base of a decagonal prism is a decagon.

Step: 2

The number of rectangular faces in a prism equals the number of sides of the base polygon.

Step: 3

Number of rectangular faces in a decagonal prism = Number of sides in a decagon =10

Step: 4

So, a decagonal prism will have 10 rectangular faces.

Correct Answer is : 10

Step: 1

A rectangular prism has two congruent rectangular bases and four rectangular side faces joining the two bases, where the opposite side faces are parallel and congruent.

Step: 2

When the given net is folded, it matches with Figure 3.

Step: 3

So, Figure 3 is the rectangular prism that the net shown would fold into.

Correct Answer is : Figure 3

Step: 1

The nets in Figure 1, Figure 3 cannot be folded into a rectangular prism as shown.

Step: 2

The net in Figure 2 can be folded into the rectangular prism as shown.

Step: 3

The net in Figure 4 has only 5 faces.

[A rectangular prism has six faces in the form of rectangles or squares, with the opposite side faces being congruent and parallel.]

Step: 4

So, the net in Figure 2 represents the rectangular prism shown.

Correct Answer is : Figure 2

Step: 1

A rectangular prism has six faces in the form of rectangles or squares, with the opposite side faces being congruent and parallel.

Step: 2

The nets in Figure 1 and Figure 2 cannot be folded into rectangular prisms as they have only 5 faces.

Step: 3

Figure 3 has six faces and its bases are in the form of squares.

Step: 4

So, Figure 3 can be folded to form a rectangular prism .

Correct Answer is : Figure 3

Step: 1

The net in Figure 1 has only 5 faces.

[A rectangular prism has six faces in the form of rectangles or squares, with the opposite sides being congruent and parallel.]

Step: 2

The nets in Figure 2 has six faces but cannot be folded into a rectangular prism as shown.

Step: 3

The net in Figure 3 can be folded into a rectangular prism as shown.

Step: 4

So, Figure 3 represents the net for the rectangular prism.

Correct Answer is : Figure 3

Step: 1

The triangular prism has 5 faces including the 2 triangular bases.

Step: 2

Among the given figures, Figure 3 has 2 triangular bases and 3 rectangular faces.

Step: 3

So, Figure 3 is the net for forming a triangular prism.

Correct Answer is : Figure 3

Step: 1

A solid whose bases are rectangles is called a cuboid.

Step: 2

Figure 1 can't folded up to form rectangular solids since it has square shape bases.

Step: 3

Figures 2 and 4 can't be folded up to form rectangular solids since they have only 5 faces.

Step: 4

Figure 3 has six faces and its bases are in rectangular shape.

Step: 5

So, Figure 3 can be folded into a cuboid.

Correct Answer is : Figure 3

Step: 1

A rectangular box with the top has 6 faces. The opposite faces of the box are parallel and congruent.

Step: 2

If you fold the net shown in Figure 1, box 1 is the base, boxes 2, 3, 4 and 5 will form lateral faces and box 6 is placed in the top part. The figure looks like rectangular box.

Step: 3

Figure 2 has 3 rectangular and 3 square boxes.

Step: 4

If you fold the net shown in Figure 2, box 1 is the base, boxes 2, 3, 4 and 5 will form lateral faces and the box 6 is the top part. In the closed figure, the top is not covered fully.

Step: 5

So, figure 2 cannot form a rectangular box.

Step: 6

Figure 3 has 4 rectangular and 2 square boxes.

Step: 7

If you fold the net shown in Figure 3, box 1 is the base and the boxes 2, 3, 5 and 6 will form lateral faces and the box 4 is the top part, which is in the shape of a rectangular box.

Step: 8

Figure 1 and Figure 3 form a closed rectangular box with a top.

Correct Answer is : Figure 1 and Figure 3

- Areas of Triangles-Gr 6-Solved Examples
- Areas of Composite Plane Figures-Gr 6-Solved Examples

- Three-Dimensional Figures