SCRATCH YOUR BRAIN w 11. The length and breadth of a rectangle are 6 cm and 3 cm, respectively. Find the perimeter of a rectangle formed by joining the width of 3 such rectangles. om and 2 m respectively.
Answers
Answer:
Perimeter of a Rectangle
Rectangles are four-sided polygons. Following are the properties of a rectangle:
(i) All the angles of a rectangle are 90º.
(ii) Opposite sides of a rectangle are always the same in size.
Properties of a Rectangle
Perimeter of a rectangle
The perimeter of a rectangle is the total length of all the sides of the rectangle. Hence, we can find the perimeter by adding all four sides of a rectangle.
Perimeter of a rectangle
Perimeter of the given rectangle is a + b + a + b. Since opposite sides of a rectangle are always equal, we need to find the dimensions of only two sides to find the perimeter of a rectangle.
The perimeter of the above rectangle with sides ‘a units’ and ‘b units’ is:
a + b + a + b = 2a + 2b = 2 (a + b) units.
Hence, the formula for the perimeter of a rectangle = 2 × (sum of adjacent sides)
Answer:
l=6cm, b=4cm
Area of rectangle =l×b=6×4=24cm2
Area of Δ=21×b×h=3×area of rectangle
1××h=×24
h=24cm