solve the circled questions pleaseee ✌✌✌
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Step-by-step explanation:
4. radius in case 1 (r) = 7cm
radius in case 2 (r') = 14cm
ratio of their surface areas = 4πr²/4πr'²
= (r/r')²
= (7/14)² = 1/4
6. SA. of sphere = 4πr²
154 = 4*22*r²/7
r² = (154*7)/(22*4)
r = √(7²/2²)
r = 7/2 = 3.5cm
8.inner radius = 5cm
thickness = 0.25cm
outer radius(r) = 5+0.25 = 5.25cm
CSA of hemisphere = 2πr²
= 2*22*5.25/7
= 44*0.75
= 33cm²
What a coincidence I am in the same class as u...and we've done this question several times
hope it helps :D
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