Answer:
looks like D! Have a nice day :D
<h2>Hey there! </h2><h2>

</h2><h3>DIVIDE by

on BOTH SIDES </h3><h3>

</h3><h3>CANCEL out:

because it gives you

</h3><h3>KEEP:

because it helps us solve the number that is being

to

</h3><h3>

</h3><h2>Good luck on your assignment and enjoy your day! </h2><h2>~

</h2><h3 />
Less than 90°. All acute angles in a triangle are less than 90°.