figuras

document.write("Figura A<br>")
fil = window.prompt("filas")
col = window.prompt("columnas")
for (let i = 0; i < fil; i++) {

  for (let i = 0; i < col; i++) {
    document.write("*") 
  }
  document.write("<br>")   
}

document.write("<br>")
document.write("Figura B<br>")
for (let i = 0; i < fil; i++) {

  for (let j = 0; j < col; j++) {
    if (i==0||i==fil-1||j==0||j==col-1) {
      document.write("*")    
    }
    else{
      document.write("&nbsp")
    }

  }
  document.write("<br>")    
}

document.write("<br>")
document.write("Figura C<br>")
for (let i = 0; i < fil; i++) {

  for (let j = 0; j < i+1; j++) {
    document.write("*") 
  }

  document.write("<br>")   
  }
document.write("<br>")
document.write("Figura D<br>")
for (let i = 0; i < fil; i++) {

  for (let j = 0; j < i+1; j++) {
    document.write("&nbsp") 
  }
  for (let k = 0; k < fil-(i+1); k++) {
    document.write("*") 
  }

  document.write("<br>")   
}

document.write("<br>")
document.write("Figura E<br>")
for (let i = 0; i < fil; i++) {

  for (let j = 0; j < fil-(i+1); j++) {
    document.write("&nbsp") 
  }
  for (let k = 0; k < i+1; k++) {
    document.write("*") 
  }

  document.write("<br>")   
}

document.write("<br>")
document.write("Figura F<br>")
for (let i = 0; i < fil; i++) {

  for (let j = 0; j < col-i; j++) {
    document.write("*") 
  }

  document.write("<br>")   
  }