Question

pls proof the sum of angles of a triangle is 180°. I give you 6 point for answering.

Answer 1

Given:
Triangle ABC with angles 1,2&3

To prove:
angle1+angle2+angle3=180

Construction:
Draw xy line parallel to BC (XY II BC)

Proof:
XAY is a line
Therefore,
angle1+angle4+angle5=180 (st. angle)- 1

XY II BC

Therefore,
angle2=angle4 (Alternate interior angles)-2
angle3= angle5(Alternate interior angles)-2

by using 1&2

angle1+angle2+angle3 = 180

Hope my answer helped you.

Answer 2

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