Niko is looking at two different options for a new cell phone plan. plan a has a fee of $40 plus an additional fee of $0.04 per minute. with this plan, the first 500 minutes are free. plan b has a fee of $60 plus an additional fee of $0.02 per minute. with this plan, the first 800 minutes are free. after how many minutes would both options cost the same amount?

b. an equilateral triangle inscribed in a circle

step-by-step explanation:

we are given the figure of two circles having a triangle inside.

now, we know that,

"when a figure is lying inside an another figure, then the outside figure is known as circumscribed figure and the figure lying inside is referred to as the inscribed figure".

as we see that, the circles are containing the triangle completely.

thus, the circles are the circumscribed figures and the triangle is the inscribed figure.

hence, we get, 'an equilateral triangle is inscribed in a circle'.