The rectangle is a plane shape with four sides. It is a 4 sided polygon with opposite sides parallel.
- Looking at the above figure we see the opposite sides are parallel and equal.
- This means DA and CB are parallel to one another. What about the other side? If we look at another side we see that those sides are parallel to that means AB and DC are also parallel to one another. So we say that in this figure, the opposite lines are parallel to one another.
- The sides DA and CB have the same length, so it clear that they are congruent. Also, side DC and AB are congruent to one another. Here in this figure, we have four angles. All the angles in a rectangle are 90°.
- So we can write it as m∠A = m∠B = m∠C = m∠D = 90°. We can also see that the adjacent angles are supplementary.
- That is 90° + 90° = 180°. The sum of all the interior angles is 90° + 90°+ 90° + 90° = 360°
- The diagonals of the rectangle are also congruent to each other and they bisect each other at their point of intersection.
- A rectangle can also be called as a quadrilateral as it has 4 sides.
Area of rectangle = length × breadth
Formula for Rectangle
There are mainly three formulas for rectangle – Perimeter, Area and Diagonal. The formulas for area, perimeter, and diagonal of a rectangle are:
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