Para calcular mentalmente 35 x 12 y 45 x 18. Ana descompone el 12 y el 18 y distribuye. 35 x 12= 35 x (10+2) = 35 x 10 + 2 x 35 = 420 45 x 18 = 45 x (20-2) = 45 x 10 - 45 x 2 =810 Usa un método similar para calcular los productos siguientes: 1.504 x 20= 189x9= de paso expliquen q no entendi un pepino jajs xfavor y gracias xde

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

f is the midpoint of

circumference divided by 3.141592654 then timesthe radius twice

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice