Answer:

Step-by-step explanation:
Since you are doing
squared, you have to multiply the exponents.
4 * 2 = 8

Answer:
169 sq cm
Step-by-step explanation:
180-(55x2)=70
Those two angles are the same... I forget the name of the law that states it, but that's the answer... x=70
Answer:
Pythagoras theorem. 20^2 times 18^2 = distance^2