1) Define perimeter. Can we find perimeter of an open figures?
2) Write formula to find perimeter of a square and perimeter of a rectangle.
3) Do as directed
a) The perimeter of a rectangle is 120 cm. If its breadth is 15 cm ,what is its length ?
b) If the perimeter of a rectangle of length 42 cm and breadth 15cm is equal to the perimeter of a square, what is the length of the side of that square ?
c) If the length and breadth of a rectangle are tripled ,how many times the perimeter of the old rectangle will that of the new rectangle be?
d) Find the perimeter of the given irregular shape
e) If the side of a square is made 5 times how many times the perimeter of the first square will that of the new square be?
4) There is a rectangle of field of 40 m length and 30 m breadth as shown below.
a) Find the area of the shaded region.
b) The shaded region is to be covered with tiles of measurement 20cm and 30 cm. How many such tiles will be needed to cover the shaded region completely?
5) Fill in the blanks.
a) The surface area of any 3D object is a sum of ________________________________________.
b) The area of a square with side 5 cm is ______.
c) The perimeter of a square with side 5 cm _____.
d) The area of a rectangle with length 5 m and breadth 4 m is _______.
e) The perimeter of a rectangle with length 5 m and breadth 4 m is ______.
6) The area of rectangle is 102 metre. If it's breadth is 6 m find the length of the rectangle.
7) If the side of the square is doubled how many times will the area of new square be as compared to the area of a original square ?
8) Do as directed .
a) Write the formula to calculate the area of a right angled triangle.
b) Find the area of a right angled triangle where base is 2.4 m and height is 13.2 m.
c) find the cost of painting the same triangle at the painting cost of rupees 1.5 per square metre.
9) Look at the 3D shape and answer the following questions.
b) it has _____ faces and each face is a ______.
c) It's _____ faces have same area.
10) Look at the 3D shape and answer the following questions
a) It is a _____.
b) It has _____ faces and each face is a ______.
c) Area of _____faces are equal.
11) Write formula to calculate the total surface area of a cube and cuboid. Also draw diagram.
12) How much sheet metal is required to make a closed rectangle box of length 1.5 m breath 1.2 m and height 1.3 m?
13) One side of a cubic box is 0.5 m. How much will it cost to paint the outer surface of the box at the rate of rs 50 per square metre ?