Volume and Surface Area Question?
For the B(iii) part of this question, my working is:
V of hemisphere = 2/3 * 3.142 * #r^3#
The volume = 13 liters, so we can consider it to be 13000 #cm^3#
13000 = 2/3 * 3.142 * #r^3#
#r^3# = #sqrt(61269)
r = 39.4 cm
But the answer according to my book is 78.8 cm, the exact double. Could someone please help me in this question?
For the B(iii) part of this question, my working is:
V of hemisphere = 2/3 * 3.142 *
The volume = 13 liters, so we can consider it to be 13000
13000 = 2/3 * 3.142 *
r = 39.4 cm
But the answer according to my book is 78.8 cm, the exact double. Could someone please help me in this question?
1 Answer
Jan 17, 2017
The calculation is for the SPHERE, the data (volume) is the HEMISPHERE. Thus, the volume of the sphere (needed in your calculation is TWICE the hemisphere's or 26L.
