menu construction 1a construct a triangle (asa) construction 1a construct a triangle (asa)...
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Construction 1a Construction 1a Construct a triangle (ASA)Construct a triangle (ASA)
Construction 1b Construction 1b Construct a triangle (SAS)Construct a triangle (SAS)
Construction 2 Construction 2 Construct the bisector of an angleConstruct the bisector of an angle
Construction 3 Construction 3 Construct the perpendicular bisector of a line segment.Construct the perpendicular bisector of a line segment.
Draw a line segment [qr] 8cm in length. Name the points and mark the length.
|qr|=8cm
46°52°
p
rq
• At q using a protractor mark and draw an angle of 52o.
• At r mark and draw an angle of 46o
• Mark the point of intersection of the two angles.
• This is the point p.
END OF CONSTRUCTION
65°
ba
c
ab=12cm
ac=9cm
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END OF CONSTRUCTION
• Draw a line segment 12cm in length. Name the points and mark the length.
• Use a protractor to draw a line at 65o to |ab|.
• Use a compass with a as centre and 9cm radius to draw an arc on this line.
• Mark the point of intersection c.
• Join c to b and complete labels.
Draw the angle aob. Using the vertex o as centre draw an arc to meet the arms of the angle at
x and y. Using x as centre and the same radius draw a new arc. Using y as centre and the same radius draw an overlapping arc. Mark the point where the arcs meet. The bisector is the line from o to this point.
y
x
o
a
b
xxxx
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END OF CONSTRUCTION
Draw the line segment
a b
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END OF CONSTRUCTION
• Using a as centre and a radius greater than half |ab| draw an arc.• Using b as centre and the same radius draw another arc.• Draw a line through the points where the arcs cross.
Ms.S.Saifee