perimeter of rectangle
and square and triangle
Answers
Rectangle: 2(l+b)
square: 4a
triangle: a+b+c
hope you find this helpful.
Answer:
Area Formulas for different geometrical figures:
Figures Area Formula Variables
Area of Rectangle Area = l × w l = length
w = width
Area of Square Area = a2 a = sides of the square
Area of a Triangle Area = 1/2 b×h b = base
h = height
Area of a Circle Area = πr2 r = radius of the circle
Area of a Trapezoid Area = 1/2 (a + b)h a =base 1
b = base 2
h = vertical height
Area of Ellipse Area = πab a = radius of the major axis
b = radius of the minor axis
Perimeter Formulas for different geometrical figures:
Geometric Shape Perimeter Formula Metrics
Parallelogram 2(Base + Height)
Triangle a + b + c a, b and c being the side lengths
Rectangle 2(Length + Width)
Square 4a a =Length of a side
Trapezoid a +b+c+d a, b, c, d being the sides of the trapezoid
Kite 2a + 2b a = Length of the first pair of equal sides
b = Length of the second pair of equal sides
Rhombus 4 x a a = Length of a side
Hexagon 6 x a a = Length of a sideSwipe left
Also, read:
Area Circle Area Of Equilateral Triangle
Area Of Square Area Of Rectangle
Area Of Isosceles Triangle Area Of Parallelogram
Area and Perimeter of Special Triangle
An Equilateral triangle is a special triangle having all the three sides equal. To find its perimeter and area we need to know all the three sides of it.
Equilateral Triangle
The perimeter of an equilateral triangle = 3 x length of a side = 3l.
Area of an equilateral triangle = √3 / 4 a2
Solved Examples
Let us see some of the examples using Area and perimeter formulas:
Example 1: Find the perimeter of a rectangular box, with length as 6 cm and breadth as 4 cm.
Solution: Use the formula,
Perimeter of a Rectangle = 2 (L+B) = 2 ( 6 cm + 4 cm) = 2 × 10 cm = 20 cm.
Example 2: How to find the area and perimeter of a square? Find the perimeter of a square if the area is 36 cm2.
Solution: A square is a shape with all the four sides equal in length. These four sides are also parallel to each other. They also make an angle of 90° with each other. To find the area and perimeter of the square, we need to know the measurement of one side of the square.
Area of a square = (Side)2, and
Perimeter of a square = 4(Side)
Given: Area is 36 cm2
(Side)2 = 36
Or Side = 6 (Ignored negative value as length cannot be negative)
Again, using perimeter formula, we have
Perimeter = 4(Side) = 4 x 6 = 24
So, 24 cm is the perimeter of a square.
Area and Perimeter is a very important topic in math and students are advised to go through the list of formulas listed above before working on the problems for better understanding and preparation.
80,199
Download BYJU’S-The Learning App and get personalised videos for all the mathematical concepts from Class 1 to 12.
MATHS Related Links
Similar Triangles Examples Line Of Symmetry
Important Questions Class 8 Maths Chapter 4 Practical Geometry Union And Intersection
Factors Of 21 Value Of Log 2
Arithmetic Progression Questions Important Questions Class 8 Maths Chapter 12 Exponents And Powers
Relations And Functions Class 11 Inverse Cosine