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I have no idea what to put statement and reason

I have no idea what to put statement and reason-example-1

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Verrrry interesting !

Look at the drawing:

JX = JY, so the inside triangle is isosceles.

Angle 1 = Angle 2.
Base angles of an isosceles triangle are equal.

Angles (1 + 3) = Angles (2 + 4).
The sum of all the angles on one side of a line is 180 degrees.

Well ! If (1 + 3) = (2 + 4), and 1 = 2, then Angle 3 = Angle 4 .

Now look at the two skinny, slanty outside triangles:

JX = JY given
Angle 3 = Angle 4
KX = KY given

So the two skinny slanty outside triangles are congruent (side-angle-side)

Then JK = JL corresponding parts of congruent triangles.

So the big outside triangle is isosceles, since JK = JL .

Q.E.D.


User Dan McGrath
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