Constructing a triangle (2 sides and the included angle)

Why is he keeping the compass on point B?

• It does not matter. He can keep it anywhere

• Because AB is given as 6cm that is why he is drawing the 6cm length arc on the angle line

What type of triangle is this?

• Equilateral

• Isosceles

• None of these

Answer explanation

We only know one angle as 60 degrees.

For a triangle, the sum of angles is 180 degrees.

We only know that the sum of other two angles must be 120 degrees. We do not know if they are equal or not.