:) কোন তারিখে ‘বিশ্ব স্বাস্থ্য দিবস’ পালিত হয় ?​

Explanation:

Mosquitoes, ticks and other biting arthropods, and the pathogens associated with them, causing arthropod-borne diseases, have always been the most dangerous enemies of mankind.

Answer:

becoz nowadays they re cutting trees nd poaching animal which is harmful to themselves not only this human behaviour.

Explanation:

human behaviour bcoz they re so selfish that they re harming environment nd animals for there greed

Answer:

• everyone needs a member besides them, who care , be a comfort zone for us and pay attention to the words we are saying to them.
• but nowadays no one cares a little bit about that. So we feel like we have nobody else to share our thoughts.
• so," good listener" means who is a well-wishers for the people who they care.
• they will listen to us and respect our thoughts. they will be liked by anyone else in the world.
• So, they are also the people who can flatter anyone . so, they are silent flatterer.

thanks for your patience to read all my thoughts about this sentence.

Answer:

no hewas not a strict teacher

Students who are not listened to the teacher if the teacher is strict he or she can listen

search-icon-header

Search for questions & chapters

search-icon-image

Class 11

>>Applied Mathematics

>>Straight lines

>>Introduction

>>Show that the points (a,a), ( - a, - a)

Question

Bookmark

Show that the points (a,a),(−a,−a) and (−

3a

,

3a

) are the vertices of an equilateral triangle. Also, find its area.

Medium

Solution

verified

Verified by Toppr

Let A(a,a),B(−a,−a)andC(−

3

a,

3

a) be the given points. Then, we have

AB=

(−a−a)

2

+(−a−a)

2

=

4a

2

+4a

2

=2

2

a

BC=

(−

3

a+a)

2

+(

3

a+a)

2

BC=

a

2

(1−

3

)

2

+a

2

(

3

+1)

2

BC=a

(1−

3

)

2

+(1+

3

)

2

BC=a

1+3−2

3

+1+3+2

3

=a

8

=2

2

a

AC=

(−

3

a−a)

2

+(

3

a−a)

2

AC=

a

2

(

3

+1)

2

+a

2

(

3

−1)

2

AC=a

(

3

+1)

2

+(

3

)−1)

2

AC=a

3+1+2

3

+3+1−2

3

=a

8

=2

2

a

Clearly, we have

AB=BC=AC

Hence, the triangle ABC formed by the given points is an equilateral triangle.

Now,

Areaof△ABC=

4

3

(Side)

2

⇒Areaof△ABC=

4

3

×AB

2

⇒Areaof△ABC=

4

3

×(2

2a

)

2

sq.units=2

3

a

2

sq.units