Answer:
The area of the shaded region is 21.45cm².
The answer is 36. because 12x3=36, 9x4=36, and 4x9=36, so it is the least common denominator
Answer: 
<u>Step-by-Step Explanation:</u>
Pythagorean Theorem is: a² + b² = c² , <em>where "c" is the hypotenuse</em>

Note: (15)² + (3√11)² = hypotenuse² → hypotenuse = 18

Note: 8² + 15² = hypotenuse² → hypotenuse = 17

Note: hypotenuse not needed for tan

Note: 2² + 6² = hypotenuse² → hypotenuse = 2√10
Your answer for the least common multiple will be 2