Question

hey friends solve this problems step by step

Answer 1

4. Given,
volume of a cube = 1000 cm^3
Now,
As we know,
volume of a cube = a^3
1000 = a^3
a = 10 cm

5. I don't know volume of pyramid.

6. Given,
l = 12
b = 10
h = 8
Now, volume of cuboid = lbh
= 12 × 10 × 8
= 960 cm ^3

7. Given,
edge of cube= 12 cm
Now,
volume of cube = a^3
= (12)^3
= 1728 cm^3

8.Given,
r = x
h = y
Now,
curved surface area of cylinder = 2pi(r)(h)
= 2 pi x y cm ^ 2

9. some confusion. sorry
10.Given,
radius= 2cm
slant height = 3.5 cm
Now,
curved surface area=pi(r)(l)


=22/7×2×3.5
= 22 cm^2

11.Given,
r =10 cm
l =3.5 cm
Now,
total surface area=pi(r)(r+l)
=22/7×10(10+3.5)
=423.9 cm

12.Given,
r = 6.3 cm
Now,
volume of sphere = 4/3(pi)(r)^3
=4/3×22/7×(6.3)^3
= 1047.816

13. Given,
side of cube= 20cm
Now,
total surface area of cube
= 6(l)^2
= 6×(20)^2
=2400 cm^2

Answer 2

1.) volume of cube = s^3
1000 = s^3
s= 10
the side of the cube is 10 cm
2.) volume of square pyramid = 1/3 a^2 h
1/3 (10)^2 × 8
1/3×800
266.66
3.) volume of cuboid = L*B*H
= 12×10×8 = 960
4.)volume of cube = a^3
= 12^3 = 1728cm^3
5.) curved surface area of a cylinder is 2pie RH
r=x and h=y then
curved surface area = 2 pie x y
6.) let the original radius of a cylinder be (r)
and original hight of cylinder be (h)
original lateral surface area is 2 pi r h

radius is doubled then new radius is = 2r
new hight of cylinder = H
new lateral surface = 2 pi R H

original lateral surface area = new lateral surface area
2 pi r h = 2 pi R H
h = 2H
H = h/2
7.) radius = 2cm
height = 3.5cm
curved surface area = pi R L
= 22/7 × 2 × 3.5
= 22^2 cm