JAMB - Mathematics (1993 - No. 27)
find the radius of a sphere whose surface area is 154cm2 (\(\pi = \frac{22}{7}\))
7.00cm
3.50cm
3.00cm
1.75cm
คำอธิบาย
Surface area = 154cm2 (area of sphere)
4\(\pi\)r2 = 154
r\(\sqrt{\frac{154}{4\pi}}\)
= 3.50cm
4\(\pi\)r2 = 154
r\(\sqrt{\frac{154}{4\pi}}\)
= 3.50cm