Question
The surface area of a sphere is 2,464 cm2. If
the sphere is cut into two equal pieces, then find the total surface area of each hemisphere thus formed. (Take π = 22/7)Solution
Area of hemisphere = 3πr {where ‘r’ is the radius}
Surface area of sphere = 4πr2 (Where ‘r’ is the radius)
Let radius of the given sphere ‘r’ cm
ATQ;
2464 = 4 × (22/7) × r × r
Or, r2Â = 196
So, r = 14
Required area = 3 × (22/7) × 14 × 14 = 1,848 cm2
(1/2) – (3/5) + 3(1/3) = ? + (5/6)
12.50% of 1440 - 17 × 51 + 721 =?
What will come in the place of question mark (?) in the given expression?
224 ÷ 8 + 480 ÷ 15 = ? ÷ 2 – 270 ÷ 18
Calculate the value of x2,  if [(8 + 62) ÷ 4 of x + 2.5 × 5 = 42 + 20% of 10].
Find the simplified value of the following expression:
62 + 122 × 5 - {272 + 162 - 422}
- Find the value of the expression:
25 + 9 – 8 × [10 + 14 – 2 × (33 – 18)] 30% of 800 - ?2 = 15Â
What will come in the place of question mark (?) in the given expression?
75% of (√64 × 8 - 16) × ? = 15²
95% of 830 - ? % of 2770 = 650
78.89 × 81.03 – (16.83)² + 8.33% of 9602.87 = ? – 50.23
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