Question

1. Find the perimeter of a triangle whose sides are 18c.m,
22c.m and 16c.m.
2. Find the perimeter of a rectangle whose length is 35c.ma
breadth is 28c.m.
3. How many line segments are there in each of the followin
figures:
a) A
B b)
A
C С
D
B
C С
4. If one pen costs Rs.8, Find the cost of 6 such pens.
5. The cost of 5 balls is Rs.40. Find the cost of 3 balls?
6. Convert the following into rupees:​

Answer 1

Answer:

56cm

Explanation:

perimeter of triangle= sum of all sides

Answer 2

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Question : Find the perimeter of a triangle whose sides are 18cm, 22cm and 16cm.

Answer :

Given that -

• 1st side of triangle = 18 cm
• 2nd side of triangle = 22 cm
• 3rd side of triangle = 16 cm

To find -

• Perimeter of triangle

Solution -

• Perimeter of triangle = 56 cm

Using concept -

• Formula to find perimeter of triangle.

Using formula -

• Perimeter of triangle = (a+b+c)

Where,

• a denotes 1st side of triangle
• b dentoes 2nd side of triangle
• c denotes 3rd side of triangle

Full solution -

→ Perimeter of triangle = (a+b+c)

→ Perimeter of triangle = (18+22+16)

→ Perimeter of triangle = (40+16)

→ Perimeter of triangle = 56 cm

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Question : Find the perimeter of a rectangle whose length is 35 cm and breadth is 28 cm.

Answer :

Given that -

• Length of rectangle = 35 cm
• Breadth of rectangle = 28 cm

To find -

• Perimeter of rectangle

Solution -

• Perimeter of rectangle = 126 cm

Using concept -

• Formula to find p of rectangle

Using formula -

• P of rectangle = 2(l+b)

Where,

• P denotes perimeter
• l denotes length
• b denotes breadth

Full solution -

→ Perimeter of rectangle = 2(l+b)

→ Perimeter of rectangle = 2(35+28)

→ Perimeter of rectangle = 2(63)

→ Perimeter of rectangle = 2 × 63

→ Perimeter of rectangle = 126 cm

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Question : If one pen costs Rs.8, Find the cost of 6 such pens.

Answer :

Given that -

• Cost of a pen = Rs. 8

To find -

• Cost of 6 pens.

Solution -

• Cost of 6 pens = 48 Rupees

Full solution -

→ 1 pen = Rs. 8

→ 6 pens = 8 × 6

→ 6 pens = 48 Rupees

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Question : The cost of 5 balls is Rs.40. Find the cost of 3 balls?

Answer :

Given that -

• The cost of 5 balls is Rs.40.

To find -

• The cost of 3 balls

Solution -

• The cost of 3 balls = 15 rupees

Full solution -

→ Cost of 5 ball = Rupees 40

→ Cost of a ball = 40/8

→ Cost of a ball = 5 Rupees

→ Cost of 3 balls = 5 × 3

→ Cost of 3 balls = 15 Rupees

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