12. PLAN
ORTHOGONAL
PROJECTION ON
THE VERTICAL
PLANE (SIDE
ELEVATION)
ORTHOGONAL
PROJECTION ON
THE VERTICAL
PLANE (FRONT
ELEVATION)
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13. Orthogonal projection on
the horizontal plane
B
A C
D
E
F
G
H
F/C
G/B
H/A
E/D
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14. Orthoganal projection on the
Vertical plane (front elevation)
E
A
G
F
C
B
H
D
A/B
H
E
G
F
C/D
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19. MATHEMATICS FORM 5
QUESTION 1
PLAN & ELEVATION
The diagram shows a solid with rectangular base ABCD on a
horizontal plane. AP, BR, CS and DU are vertical edges.
AP =DU =3 cm and BR =CS =5 cm. Rectangles PQTU and QRST
are inclined planes. TQ is 2cm from the base. Draw in full size,
a) The plan of the solid
b) Its elevation on a vertical plane parallel to AB as viewed from X
c) Its elevation on a vertical plane parallel to AD as viewed from Y
22. QUESTION 2
The diagram shows a solid consisting of a prism and a half-
cylinder joined at the plane PAEU. Its base consisting
of a rectangle and a semicircle is on a horizontal plane.
BCSRQ is the uniformed cross section of the prism.
WPA, QB, SC, TD and VUE are vertical edges. Rectangle
PQRU is a horizontal plane while rectangle URST is an
inclined plane. The diameter of semicircle WV= 4 cm.
Draw in full size,
a) The plan of the solid
b) Its elevation on a vertical plane parallel to AB as viewed
from X
c) Its elevation on a vertical plane parallel to BC as viewed
from Y
