Question

Cuánto vale r si a es igual a 154
a= 22/7r²
r=

Answer 1

$154 = 22 \div 7 {r}^{2} \\ 7 {r}^{2} = 154 \times 22 \\ 7 {r}^{2} = 3388 \\ 7 {r}^{2} \div 7 = 3388 \div 7$

${r}^{2} = 484 \\ \sqrt{ {r}^{2} } = \sqrt{484} \\ r = 22$