Question

What is the perimeter of a semi circle whose diameter is 35cm

Answer 1

GIVEN :-

• Diameter of semicircle ( d ) = 35 cm.

TO FIND :-

• The perimeter of the semicircle.

SOLUTION :-

As we know that the perimeter of semicircle is given by,

⇒ Perimeter = πr + 2r

⇒ Perimeter = 22/7 × (d/2) + 2 × (d/2)

⇒ Perimeter = 22/7 × 35/2 + 2 × 35/2

⇒ Perimeter = 22 × 5/2 + 35

⇒ Perimeter = 11 × 5 + 35

⇒ Perimeter = 55 + 35

⇒ Perimeter = 90 cm.

Hence perimeter of the semicircle is 90 cm.

Extra Information :-

⇒ Surface area of a cuboid = 2 (lb + bh + hl)

⇒ Surface area of a cube = 6a²

⇒ Curved surface area of a cylinder = 2πrh

⇒ Total surface area of a cylinder = 2πr(r+h)

⇒ Curved surface area of a cone = πrl

⇒ Total surface area of a right circular = πrl + πr²

⇒ Surface area of a sphere =4πr²

⇒ Curved surface area of a hemisphere = 2πr²

⇒ Total surface area of a hemisphere = 3πr²

⇒ Volume of a cube = a³

⇒ Volume of a cylinder = πr²h

⇒ Volume of a cone = 1/3πr²h

⇒ Volume of a sphere =4/3πr²

⇒ Volume of a hemisphere = 2/3πr²

Answer 2

Answer:

✯ Given :-

• The diameter of the semicircle is 35 cm.

✯ To Find :-

• What is the perimeter of the semicircle ?

✯ Formula Used :-

⋆ To Find the perimeter of the semicircle we know that,

✪ $\sf{\boxed{\bold{\large{\rm{Perimeter\: =\: πr\: +\: 2r}}}}}$ ✪

✯ Solution :-

⋆ Given :-

• Diameter = 35 cm

➛ To find the radius we know the formula,

✪ R = $\dfrac{D}{2}$✪

⇒ Radius = 17.5

➣ According to the question by using the formula we get,

⇒ $\dfrac{22}{7}$ × 17.5 + 2 × 17.5

⇒ 55 + 35

➠ 90 cm

$\therefore$ The perimeter of the semicircle is $\sf\boxed{\bold{\large{90\: cm}}}$

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