Answer:
108÷30=(3.6)kg of one book
3.6×150=54kg
Answer:
a=21
b=69
c=42
d=138
Step-by-step explanation:
c is supplementary to d (which is 138), so c=180-138= 42.
angle b is on the edge of the central angle 138, so b is 1/2, therefore, b=69.
angle a is complementary to angle b because any triangle that includes the diameter is a right angle, so angle a=90-69=21.
the second option
Step-by-step explanation:
Line CD is parallel to line AB, shown by the arrows in the middle of both of the lines.
