Question

(7x - 4) cm, find x. Then, find the perimeter of the triangle.
18. The angles of a triangle are 4x°. (2x + 30) and (5x - 15)°. Find the angles and then show
that the triangle is an equilateral triangle.
he article.​

Answer 1

Answer:

Step-by-step explanation:

sum of 3 angles of a ∆ = 180°

4x°+2x+30°+5x-15°=180°

11x+ 15°=180°

11x= 180-15

11x= 165°

x= 165/11

x= 15°

angle 1= 4x= 4*15 =60°

angle 2= 2x+30 = 2*15+30 =30°+30°=60°

angle 3= 5x-15= 5*15-15 = 75- 15= 60°

in equilateral ∆ all the angles are equal

here also all the angles are equal to each other .

hence this ∆ is equilateral.