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Answered on 07 Mar Learn Symmetry
Sadika
For an isosceles triangle, the line of symmetry can also be referred to as the "axis of symmetry." This line divides the triangle into two mirror-image parts, running from the apex (the vertex opposite the base) to the midpoint of the base.
Answered on 07 Mar Learn Symmetry
Sadika
Shapes with no line of symmetry do not divide into two mirror-image halves, regardless of how you try to fold or bisect them. Here are three examples:
Scalene Triangle: A triangle with all sides of different lengths and all angles of different sizes has no line of symmetry because there is no way to divide it into two parts that are mirror images of each other.
Irregular Polygon: An irregular polygon, which does not have equal-length sides or equal angles, typically has no line of symmetry. An example would be a five-sided polygon where no two sides or angles are the same.
Parallelogram (excluding rectangles and rhombuses): A general parallelogram (which is not a rectangle or rhombus) has no lines of symmetry. Its opposite sides are equal in length, and opposite angles are equal, but it does not fold into two parts that are mirror images of each other unless it is a special type like a rectangle or rhombus, which do have lines of symmetry.
These shapes illustrate that symmetry is not a universal characteristic of all geometric figures.
Answered on 07 Mar Learn Symmetry
Sadika
An example of a geometrical figure that has neither a line of symmetry nor rotational symmetry is a scalene triangle. A scalene triangle is defined by having all three sides of different lengths and all three internal angles of different measures. This lack of uniformity means it cannot be divided into two mirror-image halves by any line (i.e., it has no line of symmetry). Additionally, it cannot be rotated around its center to a position where it looks exactly the same as its original position (i.e., it has no rotational symmetry), except at rotations of 360°, which applies to all figures as a return to the original orientation and is generally not considered when discussing rotational symmetry.
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Answered on 07 Mar Learn Perimeter and Area
Sadika
To find the area of a square with a side length of 16.5 decameters (dam) in square meters:
Area = side^2 = (16.5 dam)^2 = 16.5^2 dam^2 = 272.25 m^2
So, the area of the square is 272.25 square meters.
Answered on 07 Mar Learn Perimeter and Area
Sadika
To find the area of a rectangular field in acres with sides of 200 meters and 125 meters:
Then, we convert the area from square meters to acres. Since 1 acre is equal to 4046.86 square meters:
So, the area of the rectangular field is approximately 6.18 acres.
Answered on 07 Mar Learn Perimeter and Area
Sadika
To find the cost of painting the wall, we first need to calculate the area of the wall excluding the area covered by the door, and then multiply it by the cost per square meter.
Calculate the cost:
So, the cost of painting the wall is Rs 235.
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Answered on 07 Mar Learn Perimeter and Area
Sadika
First, let's find the perimeter of the rectangle, which is equal to the length of the wire:
Perimeter of the rectangle = 2 * (length + breadth) = 2 * (40 cm + 22 cm) = 2 * 62 cm = 124 cm
Since the wire is bent to form a square, the perimeter of the square will also be 124 cm.
Now, let's find the measure of each side of the square:
Perimeter of the square = 4 * side
So, 4 * side = 124 cm
Dividing both sides by 4:
side = 124 cm / 4 = 31 cm
Each side of the square will measure 31 cm.
Now, let's find the area enclosed by each shape:
Area of the rectangle = length * breadth = 40 cm * 22 cm = 880 cm²
Area of the square = side * side = 31 cm * 31 cm = 961 cm²
Comparing the two areas, we find that the square encloses more area than the rectangle.
Answered on 07 Mar Learn Perimeter and Area
Sadika
First, let's find the area of one tile:
Area of one tile = Length × Width = 22 cm × 10 cm = 220 cm²
Now, we need to convert the area of one tile from square centimeters to square meters since the room dimensions are given in meters.
1 square meter = 10,000 square centimeters
So, 220 cm² = 220 / 10,000 m² = 0.022 m²
Next, let's find the area of the room:
Area of the room = Length × Width = 9.68 m × 6.2 m = 59.936 m² (approximately)
Now, let's find how many tiles are needed to cover the floor of the room:
Number of tiles = Area of the room / Area of one tile = 59.936 m² / 0.022 m² ≈ 2724 tiles
Now, let's find the total cost of the tiles at the rate of Rs 2.50 per tile:
Total cost = Number of tiles × Cost per tile = 2724 tiles × Rs 2.50 per tile = Rs 6810
So, the total cost of the tiles will be Rs 6810.
Answered on 07 Mar Learn Perimeter and Area
Sadika
To find the area of the square field, we need to square the length of one side:
Area of the square field = (Side length)² = 179 m × 179 m = 32041 m²
Now, let's find the cost of raising a lawn on the field at the rate of Rs 1.50 per square meter:
Cost = Area of the field × Rate per square meter = 32041 m² × Rs 1.50/m² = Rs 48061.50
So, the cost of raising a lawn on the field will be Rs 48061.50.
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Answered on 07 Mar Learn Perimeter and Area
Sadika
First, let's find the distance around the field, which is the perimeter of the rectangle:
Perimeter of the rectangle = 2 × (Length + Width) = 2 × (290 m + 210 m) = 2 × 500 m = 1000 m
Now, let's find the time it takes for the girl to go two times around the field:
Distance covered = 2 × Perimeter of the field = 2 × 1000 m = 2000 m
Given that the girl walks at the rate of 1.5 m/sec, we can use the formula:
Time = Distance / Speed
Time = 2000 m / 1.5 m/sec ≈ 1333.33 sec
So, it will take approximately 1333.33 seconds for the girl to go two times around the field.
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