Question

2) If the radius of the cylinder is 7.7 m, and it's curved surface area is 619.52
sq.m., then find its (i) height (ii) Total surface area.
B) In the figure is the
thaco​

Answer 1

Step-by-step explanation:

CSA of cylinder =2pie ×r × h =619.52

=2 × 22/7 ×7.7 × h=619.52

=44×1.1 × h=619.52

height h =619.52/48.4 =12.8 m

TSA of cylinder =2×pie r (h+r)

=2 × 22/7 × 7.7 (12.8+7.7)

=48.4 ×20.5 =992.2 m^2

Answer 2

Answer:

Height of the cylinder h = 12.8 m

Total surface area of the cylinder = 992.2 Sq.m

Step-by-step explanation:

Given radius of the cylinder (r) = 7.7 m

Curved surface area of the cylinder = 619.52 sq.m  

here we need to find height and total surface area of the cylinder

from given data curved surface area 2π r h  = 619.52

                                                      $2(\frac{22}{7}) (7.7) h = 619.52$  

                                                      2(22)(1.1) h = 619.52

                                                            48.4 h = 619.52

                                                                    h = 12.8 m

⇒ Height of the cylinder h = 12.8 m  

⇒  total surface area of the cylinder =  2πr (h + r)  

                                                            =  $2(\frac{22}{7} ) (7.7) (12.8 + 7.7)$

                                                            =  44(1.1)(20.5)

                                                            = 992.2 sq.m