Choose the correct option and write it in your answer book -
(0) If a triangle has sides as a, b and c then by using Heron's
formula the area of triangle is Vs (s-a)(s- b)(s -c),
where s =
at btc
(a)
3
a + b + c
(b)
2
ax bx с
(c)
2
(at b) x c
(d)
3
(ii) Surface area of cube is-
(а) ба
(b) a 3
(c) 6a²
(d) axbxc
(iii) Curved surface area of hemisphere is -
(a) zar
(b) 270
(iv)
(c) 21
(d) 2ter2
Sum of all the observations is -
total number of observations
(a) Mean
(b) Median
(c) Mid value
(d) Mode
(v) The most frequently occurring observation is -
(a) Mean
(b) Mode
(c) Median
(d) Mid value
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951 [M-2704-A]
Answers
Answered by
85
✬ ANSWER ✬
(i) If a triangle has sides as a, b and c then by using Heron's Formula the area of triangle is √s (s-a)(s- b)(s -c), where s =
- S = Sum of all sides/2
- S = a + b + c/2
(ii) Surface area of cube is-
- 6 × side² . Let the side be 'a' then T.S.A = 6a² (total surface area)
(iii) Curved surface area of hemisphere is
- 2πr²
(iv) Sum of all the observations is divided by total number of observations is -
- Mean
(v) The most frequently occurring observation is -
- Mode
________________________
➟ Some more formulae
1.) Cube
- Volume = a³ cubic units
- Lateral surface area = 4a² sq units.
- Diagonal = √3a units
2.) Hemisphere
- Volume = 2/3πr³ cubic units.
- Curved Surface area = 2πr² sq units.
- Total surface area = 3πr² sq units.
3.) Cylinder
- Volume = πr²h cubic units.
- Curved surface area = 2πrh sq units.
- Total surface area = 2πr(h + r) sq units.
Answered by
67
Answer :-
(i) If a triangle has sides as a, b and c then by using Heron's Formula the area of triangle is √s (s-a)(s- b)(s -c).
Where,
- s - Perimeter/2
- s - (a + b + c)/2
- s - semi perimeter
(ii) Surface area of cube is.
- 6a²
Where,
- a - side of the cube
(iii) Curved surface area of hemisphere is.
- 2πr²
Where,
- r - radius
(iv) Sum of all the observations is divided by total number of observations is.
- Mean of average
(v) The most frequently occurring observation is.
- Mode
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