Question

please answer me fast with explain ​

Answer 1

Answer:

Step-by-step explanation:

May be this answer is correct

Answer 2

EXPLANATION.

• GIVEN

A triangle of vertices = ABC

TO Prove.

<A + <B + <C = 180°

<1 + <2 + <3 = 180°

CONSTRUCTION.

Draw a line xy passes through p parallel to QR

PROOF.

For line XY AND QR

with transversal QR

<2 = <4 = ....(1) [ Alternate angles ]

<3 = <5 = .....(2) [ Alternate angles ]

Also for a line XY

<1 + <4 + <5 = 180° [Linear pair ]

From equation (1) and (2) we get,

<1 + <2 + <3 = 180°

Hence,

The sum of all angles of triangle is = 180°

HENCE PROVED.

Note for diagram see the image attachment.