Question

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Answer 1

Step-by-step explanation:

tsa=2×3.14r(r+h)

=2×3.14×5(5+16)=659.4cm

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Answer 2

Answer:

1) 659.4 cm²     2) 2.4 cm   3) 4πr²

Step-by-step explanation:

1) TSA(cylinder) = 2πr(h+r)

= 2 × 3.14 × 5 (16+5)

= 31.4 × 21

= 659.4 cm²

2) length= 22cm

breadth= 15cm

circumference= 2πr

⇒ 15 = 2 × 3.14 × r

⇒ 15 = 6.28 × r

⇒ r = 15/6.28

⇒ r ≈ 2.4 cm

3) CSA of cone = πRL

⇒ πrx = πRx/2

⇒ r = R/2

⇒ 2r = R

now area of base = πR²

⇒ area of base = π×(2r)²

⇒ are of base = 4πr²