1.

in the figure

Answer»

Step-by-step explanation:

(a)

Angle A + Angle B = 180-60=120

AO=BO. ( Radii)

therefore

angle A= angle B

A+B=120

A+A=120

2A = 120

A= 120/2 =60°

(b)

all angle are 60°

therefore

∆AOB is a EQUILATERAL triangle

AB=AO=BO

given that AB = 6cm

Radius AO= 6cm



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