Question

1.Determinati aria discului avand raza egala cu :
a)5 cm b)2√3 c)1,2 d)3√2 supra 2
DAU
COROANA!

Answer 1

aria discului = $\pi R^{2}$

a) 5*5*pi = 25$\pi$
b) 4*3*pi = 12$\pi$
c) 1.2*1.2*pi = 1.44$\pi$
d) 9*2/2*pi = 4.5$\pi$

Answer 2

A=2r²
a) A=2•5²=2•25=50(cm²)
b) A=2•(2√3)²=2•12=24(cm²)
c) A=2•1,2²=2•1,44=2,88(cm²)
d) A=2•(3√2/2)²=2•18/4=18/2=9(cm2)