13. The isosceles triangle EJF is one of an unknown number of isosceles triangles from the original arch. Each isosceles triangle had the same vertex angle as triangle EJF. The sum of the vertex angles equals 180°. (2 points, one for the correct equation, one for the correct solution.)

Let x = the number of isosceles triangles.

Fill in the equation with your answer from Q12 and solve for x.

___ • x = 180

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'.

you never say the total so we cant find the percentage used for petrol

step-by-step explanation:

1010: 3030

is it i think