If I'm not mistaken I believe the answer is 54
Answer:
<1 + <2 = 180
Step-by-step explanation:
Looking at the diagram
<1+<2 forms a straight line so they add to 180 degrees
<1 + <2 = 180
Yo me voy con c) 9
porque c is igual a ax3= 5x3
pienso que d deveria ser igual a bx3= 3x3
espero te ayude yo no lo estudie en espanol y pienso que cada pais nos ensena differente y perdon por mi espanol pero mi teclado es differente. :)
Since RS is a midsegment parallel to AC, that means R is the midpoint of AB and S is the midpoint of BC. The midpoint formula is:

. Using the coordinates of A and B, we have:

. Similarly, S is the midpoint of BC:

.
Since ST is a midsegment parallel to AB, then T must be a midpoint of AC:

.
Now that we have the coordinates of each point we can find the length of each segment using the distance formula:

For ST:

For RT:

For RS:
320 is the answer just add 80 four times