SOLIDS

Cuboids and Cubes

Cuboids: Consider. Match box, the shape is a cuboid

All solids have surfaces or faces. Most of them also have edges. A face may be flat (plane) or curved. A cuboid has six (6) plane faces. Each face is the shape of a rectangle.

Parts of a cuboid

An Edge: This is a line where two faces meet. A cuboid has twelve (12) straight edges.

A Vertex: This is a corner or point where three or more edges meet. A cuboid has eight (8) vertices.

Cube: This is a cuboid in which all the six faces are squares.

Step taken to draw a cuboid

Draw two square

Join corner to corner

Make the hidden edges broken

Cylinder and Prism

Cylinder: It is the shape of a coffee tin or milk tin. It has two plane faces and one curved face. It has no vertices and two curved edges. The plane faces are both circles.

Steps taken to draw a cylinder

Draw two flattened circles (eclipses)

Join the circles by two straight lines

Make the hidden edges broken lines

Prism: The base and top of a prism are always the same shape. Prisms have specific names which come from the shape of their base and top faces.. For Instance triangular prisms have their top and base to be triangles.

Cones and Pyramids

Cones: Consider a mound of rice in a bowl. The shape is a cone .It is a common shape which is usually part of a bigger object. Eg. The roof of a house is a cone shape.

Pyramids

The specific name of pyramids come from the shape of their base faces.

Assignment 1

Draw each of the following solid shapes

Cube

Cuboid

Cone

Cylinder

Assignment 2

Get cadboard paper and build ANY TWO of the following solid shapes

Cuboid

Triangle-base Pyramid

Triangular Prism

A Cylinder

Cube

Note: Assignment 2 should be submitted on the second day of resumption to school.

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