What is the value of t ?

The total degree of a line equals 180, so you will add 50 and 40 to get 90, and you will subtrade 90 from 180 to get 90.

180-90=90

also, the little square on the bottom next to the t means that it is a right angle (90 degrees)

90

Step-by-step explanation:

Right angles are all 90

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)