EXTERIOR ANGLE If the side BC of a triangle

D is a point on the side BC of triangle ABC such that angle ADC = angle BAC . If CA = 12 cm and BC = 16 cm, then the length of CD is :

The bisectors of the angles ABC and BCA of a triangle ABC meet in a point 0. What is the angle at O facing the side BC ?

Theorem 6.8 : If a side of a triangle is produced, then the exterior angle so formed is equal to the sum of the two interior opposite angles.

If the sides of a triangle are produced in an order, show that the sum of the exterior angles so formed is 360°.

If a^(2)+b^(2)+c^(2)=ab+bc+ca where a,b,c are the sides of a triangle,then the largest angle of that triangle is

If the sides of a triangle are produced in order, then the sum of the three exterior angles so formed is 90^(0)(b)180^(@)(c)270^(0)(d)360^(@)

Exterior angle theorem: If a side of a triangle is produced; the exterior angle so formed is equal to the sum of the two interior opposite angles.

THEOREM (Exterior Angle Property of a Triangle): If a side of a triangle is produced the exterior angle so formed is equal to the sum of two interior opposite angles.