Question

A wooden block has a height of 7/2 inches . What will be it's new height if 1/4 inch is removed from the top

Answer 1

The new hight will be = 7/2 - 1/4 inch

= 3.25 inch

or , 13/4 inch

Answer 2

Answer:

r = radius of hemisphere and cone = 3.5 cm ; h = height of cone

Volume, V

total

=V

cone

+V

hemisphere

=

3

1

πr

2

h+

3

2

πr

3

=166.83cm

3

⇒πr

2

(h+2r)=500.5cm

3

⇒h+2(3.5)=

π×3.5

2

500.5

Hence h=13−7=6cm

Height of toy =h+r=6+3.5=9.5cm

Surface area of hemisphere =2π(3.5)

2

=77cm

2

Cost =Rs.770