**Unit 11 **

**3 – dimensional figures **

The following are 3-dimensional :

1) This is a sphare. Objects 2). This is ellipsoid. Objects Snaped like a spere are with this shape are ellipsoid. Spherlcal.

3) This is a cube. Objects shaped like a cube are cubic.

4) These shapes are prism.

** **

** a) ** **b) **

5)These shapes are pyramids.

a) is right square pyramid

b) is an oblique triangular pyramid.

Objects shaped like pyramids are pyramidal.

6) This shape is a right cone. 7) This is cylinder Objects

Objects shaped like a cone shaped like a cylinder are

Are conical cylindrical.

8) This is a helix. 9) These figures show cross

Objects shaped like helix Sections of a cylinder.

Are helical. a) is a transverse section

( circular )

**Practice 1 **

**Practice 1**

Identify the following shapes and their sections :

** 1) ** **2) ** **3) **

** **

** 4) ** **5) ** **6) **

** 7) ** **8) **

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**Practice 2**

**Practice 2**

Draw the following sections :

1) a oblique section ofcone.

2) A Longitudinal section of a right pyramid

3) A transverse section of a square pyramid

4) A longitudinal section of a cylinder.

5) A tranverse section of an ellipsoid.

6) A tranverse section of a right hexagonal prism.

7) A longitudinal section of a right cone.

8) A longitudinal section of a right triangular pyramid.

9) A tranverse section of a right triangular pyramid.