Question

what is angle sum property write down with proof​

Answer 1

Answer:

which property you want

Answer 2

The sum of the angles of a triangle is 180°.

proof:- 1+2+3 = 180°

given:- A ∆PQR and 1, 2 and 3 are the angles of a ∆PQR.

Solve:- Let us draw a line XPY parallel to QR through the opposite vertex P.

Now, XPY is a line.

Therefore, 4+1+5 = 180°. - (1)

But XPY//QR and PQ, PR are transversals.

So,. 4= 2 and 5=3 (pairs of alternate angles)

Substituting 4 and 5 in (1), we get

2+1+3 = 180°

Thus, 1+2+3 = 180°