Answer:
right
Step-by-step explanation:
The box in the lower corner means that the angle is equal to 90 degrees, which means the angle is a right angle
The triangle is a right triangle
Answer:
B. false
Step-by-step explanation:
Answer: do a proportion
Step-by-step explanation:
So it would be a number over a number and equals X over a number.
Answer:
13.
Step-by-step explanation:
x+x+5=21
2x+5=21
2x=16
x=8