Question

1.R=25cm L= A= 2.R=3,5cm L= A= 3.R=7,8cm L= A=

Answer 1

   
1)  
R= 25 cm
L = 2πR = 2 × π × 25 = 50π cm
A = πR² = π × 25² = 625π cm²
 
2)  
R= 3,5 cm
L = 2πR = 2 × π × 3,5 = 7π cm
A = πR² = π × 3,5² = 12,25π cm²
 
3)  
R= 7,8 cm
L = 2πR = 2 × π × 7,8 = 15,6π cm
A = πR² = π × 7,8² = 60,84π cm²