Three poles are used to create the frame for a tent. the front of the tent is an isosceles triangle with ab congruent to bc. the length of the base is 1.5 times the length of the sides. the perimeter of the trangle is 21 ft. find each side length. i think that the side length ac = 10.5 ft and the side lengths ab and bc are 7 ft each. if you know the right answers, tell me if i'm right.

2? if not the correct answer you might need to provide more information

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.