If two lines are perpendicular, then they form?

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.

Which is the standard form for this number? (2 x 10) + (5 x 1) + (8 x 1 10,000 )