Please answer this correctly

3,868 m²

Step-by-step explanation:

The radius (r) of the big circle is 17 + 22 = 39

                  A = π·r²

                      = π(39)²

                      = 1521 π

The radius (r) of the small circle is 17

                  A = π·r²

                      = π(17)²

                      = 289 π

The area of the shaded region is the difference between the area of the big circle and the area of the small circle.

                 = 1521 π - 289 π

                 = 1232 π

                 = 1232(3.14)

                 = 3,868.48

45

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'.