Question

Determ aria discului avand raza egala cu:
a) 5cm
b) 2 radical din 3
c) 1,2cm
d)3 radical 2 supra 2

Answer 1

Răspuns:

aria discului =

a) 5*5*pi = 25

b) 4*3*pi = 12

c) 1.2*1.2*pi = 1.44

d) 9*2/2*pi = 4.5

Answer 2

Răspuns:

Bună,

$A_{disc} = \pi \times {r}^{2}$

$a) \: r = 5 \: cm \\ A = \pi \times {5}^{2} \\ = \blue{25\pi}$

$b) \: r = 2 \sqrt{3} \\ A = \pi \times {(2 \sqrt{3} )}^{2} \\ = \orange{12\pi}$

$c) \: r = 1,2 \: cm \\ A = \pi \times (1,2 )^{2} \\ = \purple{1,44\pi}$

$d) \: r = \frac{3 \sqrt{2} }{2} \\ A =\pi \times ( \frac{3 \sqrt{2} }{2}) ^{2} = \pi \times \frac{9}{2} \\ = \green{ 4,5\pi}$

Sper că te-am ajutat.