Answer:
72
Step-by-step explanation:
im pretty sure you just have to do 18*4
Answer: the circumference is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle, as if it were opened up and straightened out to a line segment. More generally, the perimeter is the curve length around any closed figure.
Answer:
A right triangle or right-angled triangle is a triangle in which one angle is a right angle.
<u>Therefore, one of the angles must be 90 degrees to be a right angle triangle.</u>