Question

prove that the sum of the angles of a triangle is 180 degrees

Answer 1

Heya,

FROM Δ PQR,
 
Draw a parallel line XY||QR

∠QPR + ∠PQR +∠PRQ = 180
∠2 = ∠4 and∠3 = ∠5 (ALTERNATE ANGLES)

Now, ∠1+∠4+∠5=180°(linear pair)

SO, ∠1 + ∠2 + ∠3 =180°

HOPE IT HELPS:-))

Answer 2

dhika dena apne teacher ko