choose the correct option. 1. high dry and flat land of leh is kind as ? (a) plains. (b). cold desert . (b) forest .​

Answer:

(i) 50cm

(ii) 37 cm

Step-by-step explanation:

Part (i) : -

Given that

Radius of cone(r) = 14cm

Height of the cone(h) = 0.48m

                                    = (0.48 × 100)cm

                                h  = 48 cm

Slant height of the cone (l) ?

We know that

l² = h² + r²

l² = 48² + 14²

l² = 2304 + 196

l² = 2500

l = √2500

l = 50 cm

Thus slant height of the cone is 50 cm

Part (ii) : -

Given that

Base diameter of cone = 70cm

Radius of cone(r) = 70/2

                         r = 35 cm

and

Curved surface area of the cone = 4070 cm

πrl = 4070

π × 35 × l = 4070

(22/7) × 35 × l = 4070

22 × 5 × l = 4070

110 × l = 4070

l = 4070/110

l = 407/11

l = 37

l = 37 cm

Thus slant height of the cone is 37 cm    

Note:-

CSA of Cone =   πrl   

• Base radius is 14 cm of a cone
• Height is 0.48 m of that cone

• Slant height (l) of the cone ?

Using formula of calculating the slant height of cone (l),

• l² = h² + r²

Here,

• l is slant height
• h is height
• r is radius

But before putting the values in it we would be changing the unit of height (h) which is in metres into centimetres.

➺ h = 0.48 × 100

➺ h = (48/100) × 100

➺ h = 48 cm

Therefore, height of cone in centimetres is 48cm.

Putting all the required values,

➺ l² = (48)² + (14)²

➺ l² = (48 × 48) + (14 × 14)

➺ l² = (2304) + (196)

➺ l² = 2304 + 196

➺ l² = 2500

➺ l = √2500

➺ l = 50

Therefore, slant height (l) of the cone is 50 cm.

_____________________________________

• Curved surface area (C.S.A) of the cone is 4070 cm.
• Diameter is of 70 cm.

• Slant height (l) of the cone.

★ Curved surface area of cone :-

• C.S.A. = πrl

Here,

• Value of π is 22/7
• r is radius
• l is slant height

First of all we would be finding out the radius of the cone as we have been provided with its diameter.

As we know that,

➺ r = d / 2

By using it we gets,

➺ r = 70 / 2

➺ r = 35

Therefore, radius of the cone is of 35 cm.

Putting all the values in the formula,

➺ 4070 = (22/7) (35) (l)

➺ 4070 = 22/7 × 35 × l

➺ 4070 = 22 × 35 × l / 7

➺ 4070 = 22 × 5 × l

➺ l = 4070 / 22 × 5

➺ l = 814 / 22

➺ l = 407 / 11

➺ l = 37

Therefore, slant height (l) of the cone is of 37cm.

★ Volume of cone:-

• V = ⅓ πr²h

★ Total Surface Area of cone:-

• T.S.A. = πrl + πr²

Some more formulas related to concept surface area and volume :

★ Curved surface area of cylinder:-

• C.S.A. = 2πrh

★ Total surface area of cylinder:-

• T.S.A. = 2πr (h + r)

★ Volume of cylinder:-

• V = πr²h

★ Area of cross-section:-

• Area of cross-section = πr²

★ Volume of sphere:-

• V = 4/3 × πr³

★ Volume of cube:-

• V = a³

In these formulas,

• r is radius
• h is height
• a is side of cube

Answer:

Sergi and Lushkoff are characters in the story The Beggar by Anton Chekhov. The first meeting between the Sergei and Lushkoff happened in the streets when Lushkoff was begging for money. Sergi helps Lushkoff by giving him the job of cutting woods for which the Sergi gives him money.

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Answer:

268 rupees and 32 paise

Step-by-step explanation:

original price= ₹ 258-20% of 258

= 258- 20/100 ×258

= 258-516/100

= 258-51.6

= ₹206.4

price to gain = 206.4 + 30/100 × 206.4

= ₹ 206.4+ 619.2/10

= ₹206.4+ 61.92

= ₹268.32

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Step-by-step explanation:

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Answer:

Explanation:

Benzene is a planar molecule having delocalized electrons above and below the plane of ring. Hence, it is electron-rich. As a result, it is highly attractive to electron deficient species i.e., electrophiles. ... Hence, benzene undergoes nucleophilic substitutions with difficulty

Answer:

Benzene is a planar molecule having delocalized electrons above and below the plane of ring. Hence, it is electron-rich. As a result, it is highly attractive to electron deficient species i.e., electrophiles. Hence, benzene undergoes nucleophilic substitutions with difficulty.