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Plans and Elevations

• to visualise and use 2-D representations of 3-D objects; analyse 3-D shapes through 2-D projections, including plans and elevations.

The objective of this lesson is

This is a shadow of a solid shape.What solid shape could it be a shadow of?

Shape shadows

Sphere, cylinder or cone

This is another shadow of the same solid shape, but from a different direction.What is the solid shape?

Cylinder

What words do we use for the views of solid objects from mutually perpendicular directions?

Plans and elevations

Whether a view is referred to as a plan or as a side elevation depends on the point of view of the observer.

Views from above are called plans.Views from the side are called side elevations.

Plans and elevations

Plan

Side elevation

Front elevation

Sketch the plan, side elevation and front elevation of the cuboid.

Plans and elevations

Front elevation

Plan

Take care to make the sides of the three views look correct in relation to each other.

Side elevation

Plans and elevations

Plan

Side elevation

Front elevation

Sketch the plan, side elevation and front elevation of this triangular prism.

Plans and elevations

Frontelevation

Plan

Side elevation

Plans and elevations

Plan

Side elevation

Front elevation

Sketch the plan, side elevation and front elevation of this cylinder.

Plans and elevations

Plan

Front elevation Side elevation

Plans and elevations

Plan

Side elevation

Front elevation

Sketch the plan, side elevation and front elevation of this cone.

Plans and elevations

Plan

Front elevation Side elevation

Plans and elevations

Plan

Side elevation

Front elevation

Sketch the plan, side elevation and front elevation of this L-shaped block made from three cubes.

Plans and elevations

Plan

Front elevation Side elevation

Plans and elevations

Plan

Side elevation

Front elevation

Sketch the plan, side elevation and front elevation of this ‘upside-down’ truncated cone.

Plans and elevations

Plan

Front elevation Side elevation

PLANS AND ELEVATIONSCORRECT SHAPE

Satisfy the given CONDITIONS

MEASUREMENT MUST BE ACCURATE

LATERAL INVERSION is not accepted(SONGSANG SISI TIDAK DITERIMA)

15b(ii).

Hidden line

losing marks

15

Case 1:Double line

Bold line

15a.

Case 2 :Sizes – Bigger or Smaller

Case 3:extension

Case 4 :gap

15

Case 5:Not a right angles

Y

X

Draw a full scale i. The plan of the solidii. the elevation of the solid as viewed from Yiii. the elevation of the solid as viewed from X