Answer:
1. SA = 4pi x r²
= 12.56 x 25
= 314
2. SA = 2πrh+2πr²
= (6.28 x 4 x 2) + (6.28 x 16)
= 150.8
3. SA = 6a²
= 6(11²)
= 726
4. SA= 2(wl+hl+hw)
= 2 [(7 x 15) + (10 x 15) + (10 x 7)]
= 650
5. SA= 2(wl+hl+hw)
= 2 [(4 x 20) + (2 x 20) + (2 x4)]
= 256
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Answer:
1. SA = 4pi x r²
= 12.56 x 25
= 314
2. SA = 2πrh+2πr²
= (6.28 x 4 x 2) + (6.28 x 16)
= 150.8
3. SA = 6a²
= 6(11²)
= 726
4. SA= 2(wl+hl+hw)
= 2 [(7 x 15) + (10 x 15) + (10 x 7)]
= 650
5. SA= 2(wl+hl+hw)
= 2 [(4 x 20) + (2 x 20) + (2 x4)]
= 256