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Sannidhya Mate
Subject: Maths
, asked on 17/5/18
Please tell. With proper steps. Experts please help
Answer
3
Cd Kushan
Subject: Maths
, asked on 18/4/18
3. 2 : 9 : : 64 : ?
(A) 125 (B) 275
(C) 4225 (D) 576
Answer
5
Raghav Singh
Subject: Maths
, asked on 31/3/18
In this q. I took semicircle's area and added a the triangle's area and subtracted the sector's area but the ans. In wrong in this way . Why?:
14. AB and CD are respectively arcs of two concentric circles of raddii 21 cm and 7 cm and centre O (see Fig. 12.32). If
$\angle $
AOB=30
^{o}
, find the area of the shaded region.
15. In fig. 12.33, ABC is a quadrant of a circle of radius 14 cm and a semicircle is drawn with BC as diameter. Find the area of the shaded region.
Answer
4
Raghav Singh
Subject: Maths
, asked on 30/3/18
In area of circles ch. The answers at back is written in fractions. Now i am confused what to do. If in my exams i write answer in decimals then teachers answer might not match. Also i divide everything in the begining so the teacher will not even get a link of my answer . What to do?
Answer
1
Raghav Singh
Subject: Maths
, asked on 30/3/18
Can't area of an equilateral triangle be found with 1/2 bh ? I tried in circles ch- but ans is coming wrong
Answer
1
Raghav Singh
Subject: Maths
, asked on 30/3/18
In mensuration chapters i am facing a lot of problems . Even if i memorise formulas due to some calculation error my answer keeps coming wrong. I am scared that in exams i will loose 10 marks from mensuration !!! Please tell me how to calculate more faster and correctly. I know practice is a very important thing but still the answers are not coming correct.
Answer
4
Raghav Singh
Subject: Maths
, asked on 30/3/18
How we get 21/4 ? Can we multiply in bracket and take 1/4 out?
Answer
2
Raghav Singh
Subject: Maths
, asked on 29/3/18
In exams can we use pages for rough work ? In maths exams the margins were too small to be used for rough work . I faced problems and also it took more time for calculation.
Answer
5
S.s.shri Darshini
Subject: Maths
, asked on 27/3/18
Pls. answer Q25 ????
25. In the given fig. OAB is a quadrant of radius 7 cm. Find the shaded area.
Answer
1
Dibyasree Sanyal
Subject: Maths
, asked on 27/3/18
Solve this :
Q. In the given figure, the side of square is 28 cm and radius of each circle is half of the length of the sides of the square where O and O' are centres of the circles. Find the area of shaded region.
Answer
3
Kartik Saxena
Subject: Maths
, asked on 27/3/18
Answer question number 5 fast as fast as you can please
5.
In the given figure, find the area of shaded region.
$\left[Take\mathrm{\pi}=\frac{22}{7}\right]$
Answer
1
Raghav Singh
Subject: Maths
, asked on 27/3/18
Will approx values carry marks like if i get 14.28 and for examiner it is 14.25 will my my answer be wrong.
Answer
2
Raghav Singh
Subject: Maths
, asked on 27/3/18
in this type of questions how we get theta , if we multiply each value we get 7318080 but not 105. Please help
$\frac{\theta}{360}=\frac{A}{{\mathrm{\pi r}}^{2}}\phantom{\rule{0ex}{0ex}}\Rightarrow \frac{\theta}{360}=\frac{132}{\left({\displaystyle \frac{22}{7}}\right){\displaystyle}{\displaystyle {{\displaystyle \left(12\right)}}^{2}}}\phantom{\rule{0ex}{0ex}}\Rightarrow \theta =360\times \frac{132\times 7}{22\times 12\times 12}\phantom{\rule{0ex}{0ex}}\Rightarrow \theta =105$
Answer
2
Himanshu Sharma
Subject: Maths
, asked on 27/3/18
Pls somebody ans.me question no. 25:
25. In the given figure, the side of square is 28 cm and radius of each circle is half of the length of the side of square where O and q are centre of the circles. Find the area of shaded region.
Answer
1
Asmita Mehta
Subject: Maths
, asked on 27/3/18
Q An athlete track 21 m wide consists of two straight sections 150 m long joining semicircular ends whose diameter are 84 m each. Find the area of the track. (use
$\mathrm{\pi}$
=22/7 and
$\sqrt{3}$
=1.73)
Answer
3
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What are you looking for?

(A) 125 (B) 275

(C) 4225 (D) 576

14. AB and CD are respectively arcs of two concentric circles of raddii 21 cm and 7 cm and centre O (see Fig. 12.32). If $\angle $AOB=30

^{o}, find the area of the shaded region.15. In fig. 12.33, ABC is a quadrant of a circle of radius 14 cm and a semicircle is drawn with BC as diameter. Find the area of the shaded region.

25. In the given fig. OAB is a quadrant of radius 7 cm. Find the shaded area.

Solve this :Q. In the given figure, the side of square is 28 cm and radius of each circle is half of the length of the sides of the square where O and O' are centres of the circles. Find the area of shaded region.

5.$\frac{\theta}{360}=\frac{A}{{\mathrm{\pi r}}^{2}}\phantom{\rule{0ex}{0ex}}\Rightarrow \frac{\theta}{360}=\frac{132}{\left({\displaystyle \frac{22}{7}}\right){\displaystyle}{\displaystyle {{\displaystyle \left(12\right)}}^{2}}}\phantom{\rule{0ex}{0ex}}\Rightarrow \theta =360\times \frac{132\times 7}{22\times 12\times 12}\phantom{\rule{0ex}{0ex}}\Rightarrow \theta =105$

25. In the given figure, the side of square is 28 cm and radius of each circle is half of the length of the side of square where O and q are centre of the circles. Find the area of shaded region.