Question

Aria cercului= 269 md=?
Raza=?
Lcerc=?

2) R aza= 10 cm
d=?
Aria=?
Lcerc=?

3) d=30 cm
Raza=?
Aria=?
Lcerc=?

4) Lcerc=?
Raza=?
d=?
Aria=? Vreau si rezolvari ... Sa le pot intelege . Urgent <3

Answer 1

A = π R²
269 = 3,14 * R²
R² = 269 : 3,14 = 85,66
R = √85,66 = 9,25
Lc = 2πR = 2 * 3,14 * 9,25 = 58,09 cm

2) A = πR² = 3,14 * 10² = 314 cm²
d = R +R = 10 + 10 = 20 cm
Lc = 2πR = 2 * 3,14 * 10 = 62,8 cm

3) d = 30 cm
R = d : 2 = 30 : 2 = 15 cm
A = πR² = 3,14 * 15² = 3,14 * 225 = 706,5 cm²

4) Aici doar atat:
Lc = 2πR
R = d : 2
d = 2 * R
A = πR²

Multa bafta