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Keekee9847
14.01.2020 •
Mathematics
Acylinder has radius 2.5 cm and lateral area 20 pi cm^2. what is the surface area of the cylinder in terms of pi?
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Ответ:
SA=(area of cyclic sides)+(lateral area)
SA=2πr^2+πrl
Area of the cyclic sides will be:
Area=2πr^2
=2*π*2.5^2
=12.5π cm^2
The lateral area is given by:
Area=20π cm^2
Therefore the surface area of cylinder will be:
SA=(12.5π+20π) cm^2
SA=32.5π cm^2
The answer is 32.5π cm^2
Ответ:
40 + 40 = 80
24 + 24 = 48
80 + 48 =128cm