div {
  margin: 20px;
}
.rectangle {
  width: 100px;
  height: 50px;
  background: peachpuff;
}
.circle {
  width: 50px;
  height: 50px;
  background: lightsalmon;
  border-radius: 50%;
}
.triangle {
  width: 0;
  border-bottom: 50px solid cadetblue;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
}
.trapezoid {
  width: 50px;
  border-bottom: 50px solid blanchedalmond;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
}
.cylinder {
  height: 100px;
  width: 75px;
  background: plum;
  border-radius: 20px / 70px;
}