Class 9 Maths | Chapter 12 | Exercise 12.1 Q1 | Heron's Formula | NCERT

In this session we will be continuing with the chapter "Lines and Angles".
We will cover Exercise 12.1 Q1 of chapter 12.

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#class9maths #Heron'sFormula #learnwithmansi

[Gungunswek]

when I open my book i always remember " hello my lovely students this is Mansi" 😂😂😅😅

[ygvmkjh]

Exam is near😮
Nothing is clear😳😔
No need to fear😶👍
Because Mansi mam is hear♥️♥️🙂

[LakshmiDevi-mbss]

There is one more easy method to slove this question...🙂🙂

Perimeter of triangle=180

3×a = 180
3a= 180
a=180/3
a=60cm

Semi perimeter= Perimeter/2
=180/2 = 90cm
S=90cm

Heron's formula:
=√90(90-60) (90-60) (90-60)cm²
=√90×30×30×30cm²
=√3×30×30×30×cm³
=30×30√3cm²
=900√3cm²

(BY THE WAY, TOMORROW IS MY MATHS PAPER... SO WISH ME ALL THE BEST)🎉🙃🙃

[sarikajaiswal]

Tumhe kabhi nahi pata chalaga mujhe itna Sara like kasa mila😂

[Shivkant_Chauhan]

Mam Class 9 mai 1 term mai Mcq Based question karaye please 🙏🙏🙏

[debumajhi]

*"I WISH THAT IN 2023-2024 ALL BOARD EXAM STUDENT GET 98% ABOVE MARKS TO INSPIRATION FROM MA'AM."🙏🙏🙏*

[rk]

Is this right...?

Perimeter of triangle =180 cm
3a = 180 cm
a =180/3
a = 60
Semi perimeter=180/2 which is 90 cm
Now, using Herons formula
√S(s-a)(s-b)(s-c)
√90(90-60)(90-60)(90-60)
√90×30×30×30
Now,
90 = 2 x 3 x 3 x 5
30 = 2 x 3 x 5
30 = 2 x 3 x 5
30 = 2 x 3 x 5

2×2×3×3×5×5√3
4×9×25√3
900√3
Whoever checked, thank you very much. 😊😊

[tejasshetty]

this is difficult method mam u can use easy method u can first find all it's sides and find semi perimetere by diding 180 by 2 = 90 after put this value in herons formula in the place of S you put 90 in place A you can put 60 and after calucation you get 90(30 (30)(30) now you can make 90 has 3× 30.. now make group of both 30 = 30 ×30 √ 3 ...= 900 √ 3 is the answer

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[fahimmahtabrajj]

We are so lucky to have a math teacher like you Thankyou so much Ma'am ❤️😊

[neetachandrapatel]

Easy method 👇
Perimeter=180
a+a+a=180
3a=180
a=180/3
a=60

S=perimeter/2
= 180/2
S=90°
Area of triangle= √s(s-a)(s-b)(s-c)

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[seerajohal]

Mam your different thing is that you explain single sum in detail which make you special❤❤❤

[ishikavats]

Ma'am we should simply take
Perimeter =a+a+a
180=3a
a=180/3
a=60
And then put in the formula of area

[Palak__fashion]

Mam, you have tought us so well that we got very good Marks in are exam. Mam l am so happy because l have such a good teacher in my life thankyou mam very much

[MohdIqbal-tvqg]

Another simple way is:
sum of triangle =180
s=a+a+a(s is given which is 180)
180=3a
180/3=a
60=a
now ;under root3/4(a)²=3/4(60)²
=under root 3/4×3600
3cm², 900

[nouratichandora]

Ma'am can we do it directly 180/3
Because it is an equilateral triangle

[nidhiparmar]

Madam, you have taught us so well that we got very good marks in our exams. Madam, I am very happy.Because I have such a good teacher in my life.Thnak you Thank you very much mam 🙏🙏🙏

[ghostreaper]

Mam can't we just get the value of sides first by-
a+a+a=180
3a=180
a=180÷3
a=60
Then use heron's formula...
U can check we will get the same answer...

[rustyterrornation]

Actually i think a is very easy to find because area of triangle 180
As it is given that it is a equilateral triangle so a60 b60 c60