CBSE > Class 08 | CBSE Board | Homework Help

Let a,b,c be the sides of the original ∆ & s be its semi perimeter.
S= (a+b+c)/2
2s= a+b+c.................(1)
The sides of a new ∆ are 2a,2b,2c [ given: Side is doubled]

Let s' be the new semi perimeter.
s'= (2a+2b+2c)/2
s'= 2(a+b+c) /2
s'= a+b+c
S'= 2s. ( From eq 1)......(2)
Let ∆= area of original triangle
∆= √s(s-a)(s-b)(s-c).........(3)

∆'= area of new Triangle
∆' = √s'(s'-2a)(s'-2b)(s'-2c)
∆'= √ 2s(2s-2a)(2s-2b)(2s-2c) [From eq. 2]
∆'= √ 2s×2(s-a)×2(s-b)×2(s-c)
= √16s(s-a)(s-b)(s-c)
∆'= 4 √s(s-a)(s-b)(s-c)
∆'= 4∆. (From eq (3))
Increase in the area of the triangle= ∆'- ∆= 4∆ - 1∆= 3∆
%increase in area= (increase in the area of the triangle/ original area of the triangle)× 100
% increase in area= (3∆/∆)×100
% increase in area= 3×100=300 %
Hence, the percentage increase in the area of a triangle is 300%.

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ANSWER

IN which female reproductive organs does the embryo get embedded

Posted by Raj Kishore Jena 7 years ago

CBSE > Class 08 > Science

3 answers

Gajavelli Swathi 6 years, 11 months ago

Uterus

0Thank You

Raj Kishore Jena 7 years ago

Sorry, walls of the uterus

1Thank You

Raj Kishore Jena 7 years ago

Walls of the uter

2Thank You

ANSWER

What is gravity

Posted by Manjeet Yadav 7 years ago

CBSE > Class 08 > Science

1 answers

Vansh Chauhan 7 years ago

A natural force that makes things fall down when you drop them

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ANSWER

Find area of the following polygons.

Posted by Kashyap Mandal 7 years ago

CBSE > Class 08 > Mathematics

2 answers

Gajavelli Swathi 6 years, 11 months ago

Type full question then i will give the answer

0Thank You

Vansh Chauhan 7 years ago

First show us "FOLLOWING POLYGON"

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ANSWER

What are the celestial bodies???

Posted by Praveen Mudalgeri 7 years ago

CBSE > Class 08 > Social Science

1 answers

Ashish Dhari 7 years ago

Heavenly bodies in the space called celestial bodies.

2Thank You

ANSWER

Shamu said "i saw a lion in the forest

Posted by Chaudhary Sagar 7 years ago

CBSE > Class 08 > Other Subjects

2 answers

Vansh Chauhan 6 years, 11 months ago

And said i ran

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Ashish Dhari 7 years ago

Full questions

1Thank You

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Find height of cuboif whose base area is 180 cm and volume is 900 cm

Posted by Shivam Maurya 7 years ago

CBSE > Class 08 > Mathematics

2 answers

Vansh Chauhan 7 years ago

Or 1 simple equation be like this Base Area= 180cm2 Volume=900cm3 Le the height be h cm As we know Volume =ba ×h 900cm3=180cm2×h H=900cm3/180cm2 H=5 answer

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Vansh Chauhan 7 years ago

Here, base area of cuboid is =180cm2 (given) And volume of same cuboid is = 900 cm3 Let the height be h cm As we know that Since ,Volume =ba × h Therefore Equation 900 cm3 = 180cm2 × h H= 900cm3/180cm2 H= 5 cm ans

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ANSWER

who is anglicists

Posted by Tanu Dubey 7 years ago

CBSE > Class 08 > Social Science

1 answers

Vansh Chauhan 7 years ago

A specialist in English language and literature

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ANSWER

Name an important untouchable caste of Andhra Pradesh

Posted by Krishna Pal Singh 7 years ago

CBSE > Class 08 > Social Science

2 answers

Gajavelli Swathi 6 years, 11 months ago

Madgias

1Thank You

Krishna Pal Singh 7 years ago

Madigas

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ANSWER

a field is 80 m long and 50 m broad in one corner of the field a pit which is 10 m long 7.5 m broad and 8m deep has been dugout the earth taken out of it is evenly spread over the remaining part of the field find the rise in the level of the field

Posted by Prince Prince 7 years ago

CBSE > Class 08 > Mathematics

0 answers

ANSWER

Thems of poem The land of beyond

Posted by Ravi Prakash 7 years ago

CBSE > Class 08 > English

0 answers

ANSWER

Her sister is ________ Msc (fill determiners)

Posted by Tanisha Kadian 5 years, 8 months ago

CBSE > Class 08 > English

0 answers

ANSWER

What is Primary,secondary and teritiary activities??

Posted by Thebroken Gam3R 7 years ago

CBSE > Class 08 > Social Science

1 answers

Oviya S 7 years ago

Activities that includes production and extraction of natural resources is called primary activities. Example: farming, mining Activieties that includes processing of resources is secondary activities. Example: making of bread Activities gives service like transport, loan ,market etc to the primary an secondary activities are callef tertiary activities.

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ANSWER

Define Linguist

Posted by Thebroken Gam3R 7 years ago

CBSE > Class 08 > Social Science

2 answers

Krishna Pal Singh 7 years ago

A person who read or know many languages

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Neha Tripathi 7 years ago

One how now many languages

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ANSWER

What is the name of book wrote by Pandita Ramabhai dedicated to High caste womens who suffers from restriction??

Posted by Thebroken Gam3R 7 years ago

CBSE > Class 08 > Social Science

5 answers

Vanshika Thakur 6 years, 11 months ago

The High Caste Women

0Thank You

Vanshika Thakur 6 years, 11 months ago

She wrote the book "”””₹

0Thank You

Vanshika Thakur 6 years, 11 months ago

No Gulamgiri named book was written by jyoti rao phule.

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Praveen Mudalgeri 7 years ago

Gulamgiri is the book wrote by Pandita Ramabhai.

1Thank You

Neha Tripathi 7 years ago

Gulamgiri

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ANSWER

Evaluate (1upon2)to the power -5

Posted by Ayush Gupta 7 years ago

CBSE > Class 08 > Mathematics

1 answers

Pranjali Singh 7 years ago

1Thank You

ANSWER

Short note on a farm in india and a farm in usa

Posted by Shamal Patil 7 years ago

CBSE > Class 08 > Social Science

2 answers

Gaurav Gupta 7 years ago

Sorry that was of farming inindia

1Thank You

Gaurav Gupta 7 years ago

Farming in usa the farmers are not educated and did not have imformation about new methods of farming The farmers resident are not modern These use local methords They don't get high yields

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ANSWER

Why do stars twinkle while planets not ?

Posted by Gaurav Gupta 7 years ago

CBSE > Class 08 > Science