2.
A Comprehension
A1. Choose the correct answer.
1. Neerja was a young woman
a) of immense self-respect.
b) with a lot of pride.
c) with a strong desire for popularity.
The plane was hijacked at the
airport
a) Karachi
b) Delhi
c) Mumbai
3. The three-member crew of the aircraft exhibited their
a) valour.
b) cowardice.
c) intelligence
4. It began to get dark inside the aircraft because
a) one of the hijackers turned off the lights.
b) power began to fail.
c) the sun had set.
class = 7 ch - 2
give me correct answer
Answers
Answer:
ਹ੩ਬਗਸਮ੪੨ਿਨਬਦਤ੦ਵਹ4ਨ1੍ਬਰਬ
Explanation:
61੭੫ਫ੮ਲਦੈਾੈ1੩46੯ੲ3੨੯੩੭ੀੀ੪ੌੌੇਮਾੇੌੌੌੋੌੌੇੈੌਾਹਬਕ੯ਡਡੲ੦87777੪4੬ਬ੫੪4533੪੫ਬਗ੮ਤਦ੩੪ਬ੧ਵਰ
Answer:
Given: The edges of a triangluar Board are 6 cm, 8 cm and 10 cm. & The cost of painting it at the rate of Rs 5 per cm².
Need to find: The Cost of painting?
⠀⠀━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
❍ Let's say, that the sides of triangle be x, y and z are 6 cm, 8 cm & 10 cm respectively.
⌑ We'll use Heron's formula to find out the area of the given triangular Board. First we'll calculate semi – perimeter of the triangle —
» Semi - perimeter is Gievn by sum of all sides of triangle —
\begin{gathered}:\implies\sf S = \Bigg\{\dfrac{x + y + z}{2}\Bigg\}\\\\\\\end{gathered}
:⟹S={
2
x+y+z
}
\begin{gathered}:\implies\sf S = \Bigg\{\dfrac{6 + 8 + 10}{2}\Bigg\}\\\\\\\end{gathered}
:⟹S={
2
6+8+10
}
\begin{gathered}:\implies\sf S = \cancel\dfrac{24}{2}\\\\\\\end{gathered}
:⟹S=
2
24
\begin{gathered}:\implies{\boxed{\pmb{\frak{S = 12\;cm}}}}\\\\\end{gathered}
:⟹
S=12cm
S=12cm
\begin{gathered}\therefore{\underline{\textsf{Hence, Semi-perimeter of the triangle is \textbf{12 cm.}}}}\\\end{gathered}
∴
Hence, Semi-perimeter of the triangle is 12 cm.
⠀⠀━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✇ Now, Calculating area of the triangle —
⠀
\begin{gathered}\star\;\underline{\pmb{\boxed{\sf{Area_{\:(triangle)} = \sqrt{s\Big(s - a\Big)\Big(s - b\Big)\Big(s - c\Big)}}}}}\\\\\end{gathered}
⋆
Area
(triangle)
=
s(s−a)(s−b)(s−c)
Area
(triangle)
=
s(s−a)(s−b)(s−c)
\begin{gathered}:\implies\sf Area_{\:(triangle)} = \sqrt{12\Big(12 - 6\Big)\Big(12 - 8\Big)\Big(12 - 10\Big)} \\\\\\\end{gathered}
:⟹Area
(triangle)
=
12(12−6)(12−8)(12−10)
\begin{gathered}:\implies\sf Area_{\:(triangle)} = \sqrt{12\times 6 \times 4 \times 2}\\\\\\\end{gathered}
:⟹Area
(triangle)
=
12×6×4×2
\begin{gathered}:\implies\sf Area_{\;(triangle)} = \sqrt{576}\\\\\\\end{gathered}
:⟹Area
(triangle)
=
576
\begin{gathered}:\implies\underline{\boxed{\pmb{\frak{Area_{\:(triangle)} = 24\;cm^2}}}}\;\bigstar\\\\\end{gathered}
:⟹
Area
(triangle)
=24cm
2
Area
(triangle)
=24cm
2
★
\begin{gathered}\therefore{\underline{\sf{Hence,\; Area\; of \;the\; triangle \;is \;{\pmb{\sf{24\;cm^2}}}.}}}\\\end{gathered}
∴
Hence,Areaofthetriangleis
24cm
2
24cm
2
.
⠀⠀━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
» Now, we've to find out the cost of painting the board at rupees 5 per cm². So, Let's Solve :
⠀
\begin{gathered}\longrightarrow{ \pmb{\mathbb{ COST = RATE \times AREA }}}\\\\\end{gathered}
⟶
COST=RATE×AREA
COST=RATE×AREA
\begin{gathered}\longrightarrow\sf Cost = 5 \times 24 \\\\\end{gathered}
⟶Cost=5×24
\begin{gathered}\longrightarrow\underline{\boxed{\pmb{\frak{Cost = 120}}}}\;\bigstar\\\\\end{gathered}
⟶
Cost=120
Cost=120
★
\therefore{\underline{\sf{Hence,\; the \;Cost\; of\; painting \;is~ {\pmb{\sf{Option~ c)~120~ rs}}}.}}}∴
Hence,theCostofpaintingis
Option c) 120 rs
Option c) 120 rs.