Current location - Training Enrollment Network - Mathematics courses - The math problem in the first grade of primary school is that there are four stars in three squares. His problem is to draw four with two different colors. I only have one.
The math problem in the first grade of primary school is that there are four stars in three squares. His problem is to draw four with two different colors. I only have one.
In a square abcd
Ob=oc. Angle boc = 90.
Because cf⊥be
So the angle cfb = 90
Angle ebo+ angle fgb= angle ocg+ angle ogc=90.
Because angle fgb= angle ogc{ equal to vertex angle}
So the triangle beo is congruent with the triangle ogc.