If the sum of the interior angles of a polygon is 1800º, how many sides does it have?

uh imma say 8 sides im not 100% sure but try it and if wrong then i will change my answer

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'.

no not all of them.

step-by-step explanation:

some of them have a square base.