Answer:
It's angle ABE
Step-by-step explanation:
It's supplementary because the sum of the measurements of both angles EBC and ABE is 180°
D , because 28-9=21 and 21=x
<h3>The volume of cube is 729 cubic centimeter</h3>
<em><u>Solution:</u></em>
<em><u>The surface area of cube is given as:</u></em>

Where, "a" is the length of side of cube
Given that, surface area = 486 square centimeter

<u><em>Find the volume of cube:</em></u>

Thus volume of cube is 729 cubic centimeter