Which statement about these triangles is true

I believe it is the last one- There are exactly three scalene triangles.  

Step-by-step explanation: D, C, and E are all unequal sides(scalene.

I hope this helps

Answer with explanation:

A triangle is a polygon ,which has three sides in all.

⇒A triangle is said to be Isosceles , if it's two angles or corresponding sides in front of these two angles are equal.

⇒A triangle is said to be Acute Angle Triangle , if all three angles are less than 90 degree.

⇒A Triangle is said to be Right Angled Triangle, if it's one Angle has measure equal to 90 degree.

⇒Scalene triangle is that triangle,whose all sides are unequal.

Coming to the Question:

     There are 5 triangles,A,B ,C,D,and ,E .

If you take the side of square ,as 1 unit

⇒ Triangle A=

Two sides are approximately, 4 units. So, it is a Isosceles Triangle and Acute angled triangle.

⇒ Triangle B=

All three sides has distinct length. All interior angles less than 180 degree.Scalene as well as Acute angled triangle.

⇒ Triangle C=

One Angle is right angle.So,it is right Angled triangle.All three sides are unequal,so we can call it Scalene Triangle.

⇒ Triangle D=

One Angle is right angle.So,it is right Angled triangle as well as Scalene Triangle.

⇒ Triangle E=

Angle greater than 90 degree, and all three sides are unequal.Obtuse Angled Triangle as well as Scalene Triangle.

Option D:

 There are exactly three Scalene Triangles.

step-by-step explanation: 4 cause 2+2=4