Observation table:

m2ABC

mZABE mZEBD

(y)

m2FBC

Is

m_DBF

(z)

X = y = Z =

Conclusion: Using the compass and ruler, the given angle can be

divided into given number of equal parts.

Learning outcome: The student understands to divide the angle

into equal parts using compass and ruler.

Test your knowledge: (1) If 2ABC is divided into equal parts and

measure of each part is 20 °, then what is m LABC ?

(2)If 2ABC =° and is divided

into 8 equal parts then what is

the measure of each parts?

AR

Answer:prove that their centres lie on the perpendicular bisector of the common chord. Hint: First draw 2 circles such that they intersect at two points then join the intersecting points and point of centre. Then use congruence of triangles