Surface Area of Cylinders and Spheres (HSC SSCE Mathematics Standard): Flashcards

Total area covering all outer surfaces of a 3D object

$SA = 2\pi rh$

$SA = 2\pi r^2 + 2\pi rh$

Divide diameter by 2

$SA = 4\pi r^2$

$SA = 2\pi r^2$

$SA = 3\pi r^2$

Only the curved surface, no top or bottom circles

Open hemisphere SA is exactly half of sphere SA

Curved surface ($2\pi r^2$) + circular base ($\pi r^2$)