Answer:
49°
Step-by-step explanation:
arccos x = 15/23
Answer:
A parallelogram has 180 degrees of rotational symmetry
Answer:
idk
Step-by-step explanation:
idk
Answer:
X = 45°
Y = 72°
Step-by-step explanation:
There is a supplementary angle (an pair of angles that create a straight line is equal to 180°) and there is the rule that all three angles in a triangle equal 180° as well.