Jan loves pillows and decides to make throw-pillows for her new sofa and bed. The pillows will be in the shape of an isoceles triangle. She wants to trim each pillow with white lace. The base of each triangle is
7 inches. Jan purchases a 310-inch roll of lace trim and wants to make at least 6 pillows. What is the
maximum length possible for each leg of the triangle?
a. 20.3 inches
b. 21.4 inches
C. 22.3 inches
d. 24.3 inches

C. 22.3 inches

Step-by-step explanation:

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'.

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.