Question

find the value of ABC​

Answer 1

Answer:

a = you haven't mentioned

b=20

c=160

Step-by-step explanation:

40 + 80 + ACD = 180 ( sum of all angles of a triangle.

ACD= 60

60 + ACB = 180 ( LINEAR PAIR)

ACB=120

ACB+CBC+ b= 180

120+ 40 +b = 180

b = 20

b+c=180 (LINEAR pair )

c = 160

Answer 2

$\:\: \underline{\underline{\bf{\large\mathfrak{~~Solution\:1~~}}}}$

ang(ACB)=40°+80°=120°

now ...b=180°-(120°+40°)=20°

C=180°-20°=160°

$\:\: \underline{\underline{\bf{\large\mathfrak{~~Solution \:2~~}}}}$

ang(DAE)=25°

ang(BAC)=32°

therefore...a+32°+32°=90°

=>a=90°-64°

=>a=26°

$\:\: \underline{\underline{\bf{\large\mathfrak{~~Explanation~~}}}}$

for solution(1)

ang(ACB)=ang(CDA)+ang(CAD)

• as the external angle of a triangle is the sum of the opposite two internal angles.

and...now I use this concept in several places or steps .......u can easily understand this by giving a look on this ....,

Hope this Helps You.........