Bisecting Angles
Covid19 has led the world to go through a phenomenal transition .
Elearning is the future today.
Stay Home , Stay Safe and keep learning!!!
Construction of Bisecting Angles
Using a protractor draw are angle of measure 80
^{0}.Bisect the given angle.
Step 1: Draw a ray OA.
Step 2:With the help of protractor draw an angle AOB of measure 80
^{0}
Step 3: With center O and a convenient radius draw an arc cutting arms OA and OB at P and Q respectively.
Step 4: With center P and radius more than halflength of PQ, draw an arc.
Step 5: With center Q and same radius as in the step 4, draw another arc intersecting the arc drawn in the step 4 at R.
Step 6: Join OR and Produce it to form a ray OX the angle AOX is the angle of measure 40
^{0} ( one half of 80
^{0})
Construction of Angles 60^{0},120^{0}and 180^{0}
Step 1 : Draw a line segment AB of any length.
Step 2 : Draw an arc of any radius with center A, which cuts AB
at P.
Step 3 : With same radius and center at P draw another arc,
which cuts earlier arc at Q.
Step 4 : Join AQ.
Step 5 : ∠BAD = 60
^{0}
Step 4 : With same radius and centre at Q draw another arc
which cut the first arc at R.
Step 5 : Join A and R by drawing AC.
Step 6 : ∠CAB is the required 120° angle.
Bisectors of angles 
Angles 
0^{0} and 60^{0} 
30^{0}

60^{0} and 120^{0} 
90^{0}

0^{0} and 90^{0} 
45^{0} 
60^{0} and 90^{0} 
75^{0} 
90^{0} and 120^{0} 
105^{0} 
120^{0} and 180^{0} 
150^{0} 
Geometrical Constructions
• Basic Geometric Constructions
• Construction of Line Segment
• Bisecting a Line Segment
• Constructing Angles
• Bisecting Angles
• Constructing Parallel Lines
• Construction of Triangle (SSS)
• SAS Triangle Construction
• ASA Triangle Construction
• HL Triangle Construction (Rhs construction)
• Constructing Quadrilaterals
• Constructing Triangles(when sum of sides or perimeter is given)
Home Page
Covid19 has affected physical interactions between people.
Don't let it affect your learning.