Update index.html

Author: Gmac4247

index.html

@@ -3034,13 +3034,13 @@ <h3 itemprop="eduQuestionType" style="margin:7px">Area of a Circle Segment</h3>
 <meta itemprop="disambiguatingDescription" content="Area based on the A(circle)=3.2*radius^2 formula, instead of the pi=3.14... approximation">
 <meta itemprop="usageInfo" content="Enter the segment height and either the chord length or the radius of the parent circle. The other value will be discarded in the result.">
 	<label for="segment-height">Segment Height:</label>
-  <input id="segment-height" type="number" value="0" step="any">
+  <input id="segment-height" type="number" value="null" step="any">
   <br>
   <label for="chord-length">Chord Length:</label>
-  <input id="chord-length" type="number" value="0" step="any">
+  <input id="chord-length" type="number" value="null" step="any">
   <br>
   <label for="parent-radius">Circle Radius:</label>
-  <input id="parent-radius" type="number" value="0" step="any">
+  <input id="parent-radius" type="number" value="null" step="any">
 
 <script>
 function segmentArea() {
@@ -3053,7 +3053,7 @@ <h3 itemprop="eduQuestionType" style="margin:7px">Area of a Circle Segment</h3>
   let known = [!isNaN(h), !isNaN(r), !isNaN(l)].filter(Boolean).length;
   if (known < 2) {
     document.getElementById('segment-area').innerText =
-      'Error: Provide one more known property';
+      'Enter one more property';
     return;
   }