 So you've already learned all of the different properties of a parallelogram in these videos. You're going to be talking about rectangles, so first we want to talk about what a rectangle is all of the Properties of a parallelogram hold true for a rectangle. So we already know that opposite sides are parallel So I'm just going to go ahead and mark opposite sides are parallel We also know that opposite sides are congruent. So this side is congruent as well as these opposite sides are congruent Opposite angles are congruent So we know that this angle here is congruent to this one and this angle is congruent to this one We also know that diagonals bisect one another. So if I draw the diagonals Because they bisect each other we know that this has to be congruent to this and I have too many marks here is congruent to that We also know the consecutive angles are supplementary So if we add this angle plus this angle, it's going to equal 180 degrees This angle plus this angle is going to equal 180 degrees now a rectangle has three other well actually two other properties besides these properties of a parallelogram and that is that a rectangle has So I should probably say a rectangle has four right angles and We can see that in the picture 90 degrees 90 degrees 90 degrees 90 degrees and Not only do the diagonals bisect each other, but in a rectangle the diagonals are congruent