Find the circumference of a circle that has an area of 42.25 pi

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height