General
General
Easy
Question
Find the perimeter of the rectangle whose coordinates are A (2, 3), B (8, 3), C (2, 5), D (8, 5)
- 15
- 16
- 25
- 28
Hint:
We are given the coordinates of the corner of a rectangle ABDC. We are asked to find the area of the rectangle. Perimeter means the border of the shape. To solve this question, we will find any two adjacent sides. Once we find the adjacent sides, we will use the formula for perimeter of a rectangle.
The correct answer is: 16
The given coordinates of the rectangle are:
A is (2,3)
B is (8,3)
D is (8,5)
C is (2,5)
We have to find the length of the adjacent sides of rectangle ABDC. We need be careful about the points.
To find the length we will use the following criteria:
1) If x coordinate is same, we will find the absolute distance using y coordinate. An absolute distance is the length of the point from the respective axis. If x coordinate is same then its length is measured from x axis. It is a positive quantity.
2) If y coordinate is same we will use the x coordinate to find absolute distance.
3) If the points are in same quadrant, we will have to subtract the absolute distances to find length.
4) If the points are in adjacent quadrants, we will have to add the absolute distances to find length.
We will consider the side AB as length and BD as breadth.
A and B have same signs so they are in same quadrant. And B and D have same signs so they are in same quadrant.
We will find the length of side AB.
For the points A and B, y coordinate is same. We will find the absolute distance using x coordinate. It is distance from y axis.
Absolute distance of the point A = |2|
Absolute distance of the point B = |8|
Length of AB = |8| – |2|
= 8 – 2
= 6
Length of the rectangle is 6 units.
We will find the length of side BD
For the points B and D, x coordinate is same. We will find the absolute distance using y coordinate. It is distance from x axis.
Absolute distance of the point B = |3|
Absolute distance of the point S = |5|
Length of BC = |5| - |3|
= 5 – 3
= 2
Breadth of the rectangle is 2 units.
The formula for perimeter is 2(length + breadth)
Perimeter of rectangle ABCD = 2(length + breadth)
= 2(6 + 2)
= 2(8)
= 16 units.
Therefore, perimeter of the rectangle is 16 units.
For such questions, we have to see if the points of the rectangle are in same quadrant or adjacent quadrants. We can use distance formula to find the length of sides of rectangle too.
