What border-radius values are used to round the corners of these images?

<html>
<head><style>img {border-radius: 20px 0 20px 20px;width: 75px;height: 75px;
}
body{ background-color: azure;
  text-align: center;
}</style>
</head>
<body>
   <h3>Holiday Options</h3>
   <img src="https://mimo.app/r/lighthouse.png">
  <img src="https://mimo.app/r/trees.png">
  <img src="https://mimo.app/r/beach.png"></body>
   <p>Try one of our holiday options, from romantic Spanish seaside villages, to weekend camping trips.</p>
</html>]]>
The first, third, and fourth valuesThe third and fourth valuesThe second and fourth valuesThe first and third values

The first, third, and fourth values.