Answer: Choice A
This is a 3 by 1 matrix, which can be written "3 x 1 matrix".
There are 3 rows and 1 column. The number of rows is listed first.
Answer:
a. 20°
Step-by-step explanation:
The external angle T is half the difference of the intercepted arcs:
(92° -52°)/2 = 40°/2 = 20°
∠ETR = 20°
Double of 50 is 100, so 28*100=2800, now half of the answer is 2800/2=1400
Hope it helped