What is the perimeter of the triangle shown on the coordinate plane, to the nearest tenth of a unit?

14.6 units

15.5 units

21.0 units

21.6 units

Pranza plotted point a in the coordinate plane below.

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)

Find the amplitude of a sinusoidal function that models this temperature variation