Question

Prove: The sum of the measures of all angles of a triangle is 180o​

Answer 1

Answer:

If it is a right angled triangle then 1 side will be 90

count the rest 2 sides as x plus x = 2x

2x plus 90=180

2x=90-180

2x=90

x=90/2

x equals to 45

Cross check

45 plus 45 plus 90

equals to 180

Answer 2

o

Given :

A triangle ABC.

To prove :

∠A+∠B+∠C=180

o

⟹∠1+∠2+∠3=180

o

Construction :

Through A, draw a line l parallel to BC.

Proof :

S