Question

A semi circular thin sheet of metal diameter 28cm is bent and an open conical cup is made .what is the capacity of the capacity of the cup?___(a)1000/3_/3cm cube (b)300_/3cm cube (c)700/3_/3cm cube (d)1078/3_/3cm cube​

Answer 1

♦Circumference of cone = circumference of semi circle

⇒2×π×(14)2=2πr2

⇒2πr=π×14

>>>r=7cm

♦Slant height, (l) of cone = radius of semicircular plate

l=14cm

h²=l²-r²

=14²−7²

=196−49

=147

>>>h=147 = 7√3

♦Volume of cone =13×22/7×7×7×7√3

=622.36cm3