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.

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 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.

(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. GIVEN : A triangle A B CdotD is a point of B C produced, forming exterior angle /_4. TO PROVE : /_4=/_1+/_2 i.e. , /_A C D=/_C A B+/_C B Adot

(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. GIVEN : A triangle A B C,D is a point of B C produced, forming exterior angle /_4. TO PROVE : /_4=/_1+/_2 i.e. , /_A C D=/_C A B+/_C B Adot

An exterior angle of a triangle is equal to the sum of the two interior opposite angles.

The exterior angle of a triangle is equal to the sum of two

27.Prove that an exterior angle of a triangle is equal to the sum of its interior opposite angles.

If one side of a cyclic quadrilateral is produced; then the exterior angle is equal to the interior opposite angle.