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Class - : Array
One Word Answer Questions:
Q) What is the highest Mountain range on the Earth?
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Q) Which animal is found in the desert?
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Q) What is the low land called that lies between mountains or hills called?
    
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Q) What type of trees are grown in Costal areas?
    
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Q) The Largest part of our area is covered with what?
    
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Short Answer Questions:
Q) What is a Desert?
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Q) What is land?
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Q) Describe our Earth?
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Q) What are Mountains?
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Q) What is a Forest?
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    PERIMETER

    Definition

    "The perimeter of a figure is the total distance around the edge of the figure".
    Example:

    Factors and Multiples

    Perimeter By Using A Formula

    The perimeter of some polygons can be calculated directly by using a formula.
    Let us calculate the perimeter of a rectangle and square by using a formula.

    PERIMETER OF A RECTANGLE

    In a rectangle, the perimeter is the sum of all its sides.

    Factors and Multiples
    Therefore, perimeter        = l + b + l + b
                                     = l + l + b + b
                                     = 2× l + 2 × b
                                     = 2 (l + b)
    Perimeter of a rectangle = 2 ( length + breadth )

    Examples:

    1. Find the perimeter of a rectangle whose length is 5 cm and breadth is 4 cm.
    Solution:

    Factors and Multiples

    Here, length of the rectangle = 5 cm
    Breadth of the rectangle = 4 cm
    Perimeter of the rectangle = 2 (length + breadth)
    = 2 (5 cm + 4 cm)
    = 2 (9 cm)
    = 18 cm.
    Hence, the perimeter of the rectangle is 18 cm.

    2. Find the length of the wire required to fence 3 rounds of a rectangular ground of length 20 m and breadth 15 m. Also find the cost of fencing the ground at the rate of ₨ 2 per metre.
    Solution: Length of the ground = 20 m
    Breadth of the ground = 15 m
    Perimeter = 2 (length + Breadth)
    = 2 (20 + 15)
    = 2(35)
    = 70m
    Total wire required to fence 3 rounds of ground
    = 3 × 70 m = 210 m
    Cost of fencing 1m = ₨ 2
    Cost of fencing 210 m = 210 × 2
    Cost of fencing = ₨ 420

    PERIMETER OF A SQUARE

    "The sum of all the sides of a square is its perimeter".

    Factors and Multiples

    Therefore, Perimeter of a square = 4s = 4 × side
    Examples:
    1. Find the perimeter of a square whose side is 13 cm.
    Solution:

    Factors and Multiples

    Side of a square = 13 cm
    Perimeter of a square = 4 × side
    = 4 × 13 cm
    = 52 cm.

    2. Find the side of a square whose perimeter is 36 cm.
    Solution: Perimeter of the square = 36 cm
    Perimeter = 4 × side
    36 = 4 × side
    Side = 36 ÷ 4
    Side = 9 cm.

    PERIMETER OF A TRIANGLE

    "The sum of measure of three sides of a triangle is its perimeter".

    Factors and Multiples

    So, Perimeter of a triangle, P = a + b + c
    Example: Find the perimeter of a triangle whose sides are 11 cm, 13 cm, and 8 cm
    Solution:

    Factors and Multiples

    Perimeter of a triangle = sum of its sides
    = 11 + 13 + 8
    = 32 cm
    So, the perimeter of the triangle = 32 cm.

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