Question

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Answer 1

Question (a) :

• Find the perimeter of square with side 21 cm?

Answer (a) :

↠Perimeter of square = 4 × side

↠Perimeter of square = 4 × 21

↠Perimeter of square = 84 cm

∴ The Perimeter of the square is 84 cm.

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Question (b) :

• Find the perimeter of a traingle with side 50 cm, 66 cm, 72 cm?

Answer (a) :

• The given traingle is scalene. So, let the three sides of a ∆ be x, y and z respectively.

⇒Perimeter of triangle = sum of all sides of ∆

⇒Perimeter of triangle = x + y + z

⇒Perimeter of triangle = 50 + 66 + 72

⇒Perimeter of triangle = 188 cm

∴ The Perimeter of the triangle is 188 cm.

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Question (c) :

• Find the perimeter of a Circle with radius 6.3 m

Answer (c) :

⇻Perimeter of Circle = 2πr

⇻Perimeter of Circle = 2 × 22/7 × 6.3

⇻Perimeter of Circle = 44/7 × 6.3

⇻Perimeter of Circle = 277.2/7

⇻Perimeter of Circle = 39.6 m

∴ The Perimeter of the circle is 39.6 m.

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Question (d) :

• Find the perimeter of a rectangle with length 8.9 m and breadth 4.6 m

Answer (d) :

⇢Perimeter of rectangle = 2(Length + Breadth)

⇢Perimeter of rectangle = 2(8.9 + 4.6)

⇢Perimeter of rectangle = 2(13.5)

⇢Perimeter of rectangle = 27 m

∴ The Perimeter of the rectangle is 27 m.

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Question (e) :

• Find the perimeter of a traingle with sides 0.5 m, 1.5 m, 0.25 m?

Answer (e) :

• As we have solved question (b) similarly we can solve this question by same formula.

⇥Perimeter of triangle = sum of all sides of a ∆

⇥Perimeter of triangle = 0.5 + 1.5 + 0.25

⇥Perimeter of triangle = 2.25 m

∴ The Perimeter of the triangle is 2.25 m.

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Question (f) :

• Find the perimeter of a Circle with diameter 8.4 m

Answer (f) :

↛ Radius = Diameter/2

↛ Radius = 8.4/2

↛ Radius = 4.2 m

⇻Perimeter of Circle = 2πr

⇻Perimeter of Circle = 2 × 22/7 × 4.2

⇻Perimeter of Circle = 184.8

⇻Perimeter of Circle = 26.4 m

∴ The Perimeter of the circle is 26.4 m.

Answer 2

(a)Square with side 21cm

Sol:-

Perimeter of square = 4×side

side(given) = 21cm

Therefore, perimeter = 4× (21)

Answer - 84cm

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(b)Triangle with sides (50,66,72)cm

Sol:-

Perimeter of Triangle = side+side+side

sides(given) = 50 + 66 + 72

Therefore, perimeter = 188 cm

Answer - 188cm

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(c)Circle with radius 6.3 m

Sol:-

Perimeter of circle = 2πr

Radius (given) = 6.3 m

Therefore, perimeter = 2×22/7×6.3

Answer - 39.6m

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(d)Perimeter of rectangle

Sol:-

Perimeter of rectangle = 2×(length+breadth)

Sides (given) =8.9 , 4.6 (m)

Therefore, perimeter = 2×(8.9+4.6)

Answer - 27m

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(e)Triangle with 0.5m

Sol:-

Perimeter of triangle = side +side+side

Sides (given) = 0.5 m ,1.5 m, 0.25m

Therefore, perimeter = 0.5+1.5+0.25

Answer - 2.25m

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(f)Circle with diameter = 8.4 m

Sol:-

Perimeter of circle= 2πr

Diameter (given) = 8.4m

Radius = 8.4/2

Therefore, perimeter= 2×22/7×4.2

Answer - 184.8

= 26.4 m

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HOPE IT HELPS ! :)