Question

calculati diametrul lungimea si aria unui cerc cu raza de a) 2cm
b)1,5 cm
c)radical din 2 cm
d)5 supra 2 cm

va rogg :)
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Answer 1

a) 2cm
d=2r=2*2=4 cm
L=2πr=2*2π=4π cm
A=πr²=2²π=4π cm²
b)1,5 cm
d=2r=2*1,5=3 cm
L=2πr=2*1,5π=3π cm
A=πr²=1,5²π=2,25π cm²

c)radical din 2 cm
d=2r=2*√2=2√2 cm
L=2πr=2*√2π=2√2π cm
A=πr²=(√2)²π=2π cm²

d)5 supra 2 cm d=2r=2*5/2=5 cm
L=2πr=2*5/2π=5π cm
A=πr²=(5/2)²π=25π /4=6,25π cm²