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In the adjoining figure, measures of angles bac and angles acd are indicated. Calculate the measures of the remaining angles. Is triangle abc isosceles? Give reason.

In the adjoining figure, measures of angles bac and angles acd are indicated. Calculate the measures of the remaining angles. Is triangle abc isosceles? Give reason. • 2. In the figure. If AB u CO. Z A • SO' and Z B L' the of the remaimng four angle. Gwe fer your answers. 3. In adjouung of BAC and ACD are md•cated. Cakulate the of the remaanJIW are. Is ABC ? Give reagm. 4. In given tnangle ABC. AD • AC J ' Pod c

HI, Using exterior angle theorem, angle ACD = angleA +angle ABC so 130 = 80 +angle ABCso angle ABC = 130-80 = 50 degreenow angle ACB and ACD are linear pair so angle ACB+130 = 180 angle ACB = 50 degree

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angle abc = 130 degrees - 80 degrees = 50 degrees
angle acb = 180 degrees - 130 degrees = 50 degrees.
yes, triangle abc is isosceles as it has two equal angles.
 
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