Answer:
D
Step-by-step explanation:
Im pretty sure it's D so Lets hope it is
For perimeter you add up the two sides so 15 + 21 equals 36
Answer: ya were right its 135
Step-by-step explanation:
we kno that QRS is 180 degrees.
so to get QRT we subtract 45 from 180.
180 - 45
135
ya were right