Question

(e)
The lid of a rectangular box of sides 40 cm by 10 cm is sealed all round with tape
.
What is the length of the tape required?
3. A table-top measures 2 m 25 cm by 1 m 50 cm. What is the perimeter of the
table-top?
4. What is the length of the wooden strip required to frame a photograph of length
and breadth 32 cm and 21 cm respectively?
5. A rectangular piece of land measures 0.7 km by 0.5 km. Each side is to be
fenced with 4 rows of wires. What is the length of the wire needed?​

Answer 1

Answer:

1) 100 cm

2) 7m 50cm

Explanation:

1) Perimeter for rectangle=2(L + B)

    P= 2 ( 40 + 10)

    P= 2 x 50

    P= 100 cm

The length of the tape required is 100 cm

2) Length = 2m 25cm = 200 + 25 = 225 cm

   Breath = 1m 50cm = 100 + 50 = 150cm

Perimeter of the table top = 2(L + B)

     P= 2 (225 + 150)

     P= 2 x 375

     P= 750 cm= 7m 50cm

The perimeter of the Table top is 7m 50cm