what is meaning of this sentence?the measure of the exterior angle of a triangle is equal to sum of its two interior opposite angle? 

In ΔABC

A + B + C = 1800 [Angle sum property ] .....(1)

Also

C + BCD = 1800  [Linear Pair ] ....... (2)

Equating (1) and (2)

C + BCD = A + B + C

BCD = A + B

Hence, exterior angle of a triangle is equal to sum of two interior opposite angles.

  • 8

I am giving you explanation

in this figure,

angle A + angle B = exterior angle ACD

600  + 600  = 1200

120= 1200

this shows that measure of exterior angle is equal to sum of its interior opposite angle

  • 0
What are you looking for?