1. a pair of supplementary angles is shown. one angle measures 10x and the other angle measures 70 degrees.

what is the value of x?

a) 10°
b) 11°
c) 20°
d) 21°

2. a right angle is shown divided in two parts. the measure of the angle of one part is 30 degrees and the measure of the other part is 5x plus 15 degrees. what is the value of x?

a) 3
b) 9
c) 12
d) 15

1) 10x+70 = 180

 10x = 180-70

  10x = 110

  x =11

2) 5x+15+30 =90

   5x = 90-45

   x = 45/5

   x = 9

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)