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Posted by Saswat Singh 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
Inner diameter of bowl = 10.5 cm
{tex}\therefore {/tex} Inner radius of bowl {tex}\left( r \right)=\frac{10.5}{2}{/tex} = 5.25 cm
Now, Inner surface area of bowl = {tex}2\pi {{r}^{2}}{/tex}
{tex}=2\times \frac{22}{7}\times 5.25\times 5.25{/tex}
{tex}=2\times \frac{22}{7}\times \frac{21}{4}\times \frac{21}{4}{/tex}
={tex}\frac{693}{4}c{{m}^{2}}{/tex}
{tex}\because {/tex} Cost of tin-plating per{tex} 100\text{ }c{{m}^{2}}{/tex} = ₹ 16
{tex}\therefore {/tex} Cost of tin-plating per{tex} 1\text{ }c{{m}^{2}}=\frac{16}{100}{/tex}
{tex}\therefore {/tex} Cost of tin-plating per {tex}\frac{693}{4}c{{m}^{2}}=\frac{16}{100}\times \frac{693}{4}{/tex} = ₹27.72
Posted by Tanisha Singh 3 years, 1 month ago
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Posted by Nishit Agarwal 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
- (b) 120°
- (a) 60°
- (c) 180°
- (d) {tex}\angle{/tex}q
- (a) 60°
Posted by Jatin Aggarwal 9Th D 3 years, 1 month ago
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Anvi 8A Arnav Singh11 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
{tex}\begin{aligned} & \Longrightarrow \frac{2 \sqrt{6}}{\sqrt{2}+\sqrt{3}} \times \frac{\sqrt{2}-\sqrt{3}}{\sqrt{2}-\sqrt{3}}+\frac{6 \sqrt{2}}{\sqrt{6}+\sqrt{3}} \times \frac{\sqrt{6}-\sqrt{3}}{\sqrt{6}-\sqrt{3}}-\frac{8 \sqrt{3}}{\sqrt{6}+\sqrt{2}} \times \frac{\sqrt{6}-\sqrt{2}}{\sqrt{6}-\sqrt{2}} \\ & \Longrightarrow \frac{4 \sqrt{3}-6 \sqrt{2}}{2-3}+\frac{12 \sqrt{3}-6 \sqrt{6}}{6-3}-\frac{24 \sqrt{2}-8 \sqrt{6}}{6-2} \\ & \Longrightarrow-4 \sqrt{3}+6 \sqrt{2}+\frac{12 \sqrt{3}-6 \sqrt{6}}{3}-\frac{24 \sqrt{2}-8 \sqrt{6}}{4} \\ & \Longrightarrow-4 \sqrt{3}+6 \sqrt{2}+4 \sqrt{3}-2 \sqrt{6}-6 \sqrt{2}+2 \sqrt{6} \\ & \Longrightarrow-4 \sqrt{3}+6 \sqrt{2}+4 \sqrt{3}-2 \sqrt{6}-6 \sqrt{2}+2 \sqrt{6} \\ & \Longrightarrow 0 \end{aligned}{/tex}
Posted by Ujjwal Thakur 3 years, 1 month ago
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Aryan Chauhan 3 years, 1 month ago
Posted by Ashutosh Yadav 3 years, 1 month ago
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Posted by S. Kolvalai 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
SAS congruence criterion: If two sides and included an angle of one triangle are equal to the corresponding two sides and included angle of another triangle then the two triangles are said to be congruent.
Consider {tex}\triangle{/tex}ABC, {tex}\triangle{/tex}PQR
here AB = PQ, AC = PR and {tex}\angle{/tex}A = {tex}\angle{/tex}P
Hence {tex}\triangle{/tex}ABC {tex}\cong{/tex} {tex}\triangle{/tex}PQR by SAS congruence criterion.
Posted by Yogesh Shekhadar 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
For class room : l = 7m, b = 6.5 m, h = 4 m
∴ Area of walls of the room = 2(l + b)h = 2(7 + 6.5)4 = 108 m2
Area of door = 3 × 1.4 = 4.2 m2
Area of one window = 2 × 1 = 2 m2
∴ Area of 3 windows = 3 × 2 = 6 m2
∴ Area of the walls of the room to be colour washed = 108 – (4.2 + 6)
= 108 – 10.2 = 97.8 m2
∴ Cost of colour washing the classroom at Rs. 15 per square metre = Rs 97.8 × 15 = Rs. 1467.
Posted by Sakshi Jaiswal 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
Constructing triangle ABC in which AB = 5.8 cm , BC + CA = 8.4 cm and ∠B = 45°.
Step 1: Draw a line segment AB 5.8 cm.
Step 2 : Draw ∠B = 45°.
Step 3 : With Center B and radius 8.4 cm, make an arc which intersects BX at D.
Step 4 : Join D to A.
Step 5 : Draw a perpendicular bisector of segment DA it intersect the line segment BD at point C.
Step 6 : Join C to A.
ABC is the required triangle.
Posted by Archita Singh 3 years, 2 months ago
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Posted by Aashika Bi 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
Since we know that rational number between two rational numbers is obtained by {tex}\frac{1}{2}{/tex}[a+b]
A rational number lying between -2 and -3 is {tex}\frac{1}{2}{/tex}[(-2) + (-3)],
i.e.,{tex}-\frac{5}{2}{/tex}
Now, a rational number lying between -2 and{tex}-\frac{5}{2}{/tex}is
{tex}\left.\frac{1}{2}[(-2)+\left(-\frac{5}{2}\right)\right ]{/tex}
= {tex} \frac{1}{2} \times\left(-\frac{9}{2}\right) {/tex}
= {tex}-\frac{9}{4} {/tex}
And, a rational number lying between {tex}-\frac{5}{2}{/tex} and -3 is
{tex}\frac{1}{2}\left(\left(-\frac{5}{2}\right)+(-3)\right) {/tex}
{tex}\frac{1}{2} \times\left(-\frac{11}{2}\right){/tex}
{tex}-\frac{11}{4} {/tex}
Thus, we have {tex}-2>-\frac{9}{4}>-\frac{5}{2}>-\frac{11}{4}>3{/tex}
Hence, three rational numbers between -2 and -3 are {tex}-\frac{9}{4},-\frac{5}{2}{/tex} and {tex}-\frac{11}{4}{/tex}
Posted by Mukund Vishwakarma 3 years, 2 months ago
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Posted by Bonty Clock Gaming 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
From the figure, we observe that when different pairs of circles are drawn, each pair have two points (say A and B) in common.
Maximum number of common points are two in number.
Suppose two circles C (O) and C (O’) intersect each other in three points, say A, B and C.
Then A, B and C are non-collinear points.
We know that:
There is one and only one circle passing through three non-collinear points.
Therefore, a unique circle passes through A, B and C.
{tex} \Rightarrow {/tex} O’ coincides with O and s = r where s and r are the radii of two circles C(O) and C(O')
A contradiction to the fact that C (O’,) {tex} \ne {/tex} C (O,)
{tex}\therefore {/tex} Our supposition is wrong.
Hence two different circles cannot intersect each other at more than two points.
Posted by Ashita Tamang 3 years, 2 months ago
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Posted by Yash Kaur 3 years, 1 month ago
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Preeti Dabral 3 years, 1 month ago
- Surface area of the sphere ={tex}4\pi r^2{/tex}
- For cylinder
Radius of the base = r
Height = 2r
{tex}\therefore{/tex} Curved surface area of the cylinder = {tex}2\pi rh=2\pi (r)(2r)=4\pi r^2{/tex} - Ratio of the areas obtained in (i) and (ii)
{tex}={{surface\ area\ of\ the\ sphere}\over{curved\ surface\ area\ of\ the\ cylinder}}{/tex}
{tex}={{4\pi r^2}\over{4\pi r^2}}={1\over1}=1:1{/tex}
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Preeti Dabral 3 years, 1 month ago
Therefore, 3√4 is greater.
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