WOW 30 points do this and ill give brainliest

Ihave this math question 2/3 ÷2 1/10=

What is sin 7x/4 ? i need on this urgent trig

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)