WASSCE SHS
Orthographic projection uses separate flat views. The system you choose decides where the plan and the end view sit.
An orthographic drawing shows the object as flat views, each from one direction. The front view, also called the front elevation, is the view you choose as the main face. The plan is the view from above. An end view is the view from the left or from the right. One view is not enough to make the object, because a depth can hide behind a width. You need the views the question asks for, in the system it names.
In first angle projection the plan is placed below the front view. The view from the left is placed on the right of the front view. The view from the right is placed on the left. In third angle projection the plan is placed above the front view. The view from the left is placed on the left, and the view from the right is placed on the right. Name the system in the title block or beside the views. A neat pictorial sketch does not answer a question that asked for the front view and the plan. Hidden edges in these views are dashed. Visible edges are thick and continuous.
The Technical Drawing tips guide sets out the objective paper, the geometry paper including vector geometry, and the drawing paper. Start practising on glearn.now with Kevin and Anna. WASSCE Technical Drawing tips
First angle and third angle swap the positions. If you place the plan above the front view and call it first angle, the layout is third angle. Say which system you used. The front view and the plan must share widths: what is on the left in the front view is on the left in the plan when the views are aligned. Do not draw a second front view and call it an end view. An end view shows the depth.
These are practice questions in the style of the paper, with a model answer and a mark scheme. They are not a promise of what your paper will ask.
2 marks
(a) In first angle projection, where is the plan placed? (1 mark)
(b) Where is the view from the left placed? (1 mark)
(a) Below the front view.
(b) On the right of the front view.
3 marks
State where the plan is placed in third angle projection, and how that differs from first angle. (3 marks)
In third angle the plan is above the front view. In first angle the plan is below the front view. The two systems place the plan on opposite sides of the front view.
2 marks
Why is one view not enough to describe a block that has a hole in one face? (2 marks)
A single view can hide the depth of the hole, or which face it is in. A second view shows the direction the first view cannot.
More questions on this topic are inside glearn, marked as you answer, with the reason written out. The first ones need no account.
Practise Technical Drawing freeBelow the front view. In third angle it goes above the front view. The view from the left goes on the right in first angle, and on the left in third angle. Name the system you used.
No. Orthographic projection uses separate flat views, such as the front view and the plan. A pictorial drawing shows three faces in one view. Draw the one the question asked for. All WASSCE Technical Drawing past questions