If you draw 2 equilateral triangles are congruent and share a side. what polygon is formed? is it a regular polygon?

The polygon formed is rhombus which is regular polygon.

Step-by-step explanation:

Given that if we draw 2 equilateral triangles are congruent and share a side AC as shoen in figure then

we have to tell what polygon is formed it is regular or not.

As two equilateral triangles are congruent it means also the sides of two equilateral triangle are equal.

Also the angles are of 60° which implies the angle formed at intersecting the diagonals at right angle i.e of 90°

Hence, all the properties of rhombus satisfied which implies

The polygon formed is rhombus which is regular polygon.

dont understand

step-by-step explanation:

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.