Posted by Geometry on Tuesday, August 18, 2009 at 7:22pm.
I see two right-angled triangles in which opposite angles are also equal.
So if two angles of one triangle are equal to two angles of another triangle then the third angle pair must also be equal.
"sum of angles in a triangle theorem"
what are these opposite angles that you are making reference to sorry it's been a while sense I took geometry
draw any two intersecting straight lines.
Do you see two pairs of opposing or "opposite" angles?
Aren't they equal ?
Opposite angles are equal because each of those angles is supplementary to a common angle.
A+B=180
A+C=180
B must =C
oh and also what makes angle three equal to angle to if you extended the lines
Those will be opposite angles (if two lines intersect, then opposite angles are equal)
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