Question

A triangle is constructed as shown in the figure.

Which of the following is not correct about $\Delta$ DEF?

• A. $\Delta$ DEF has all its sides equal
• B. $\Delta$ DEF is an isosceles triangle.
• C. $\Delta$ DEF is a scalene triangle
• D. $\Delta$ DEF is not an equilateral triangle

Answer 1

The correct option is A $\Delta$ DEF has all its sides equal

From the given figure, it is understood that the sides of the triangle have different lengths. Hence, its a scalene triangle, not an equilateral triangle and has an acute angle.