Is triangle ABC an acute-angled triangle ?

[amitansu]

Is triangle ABC an acute-angled triangle ?

1. The orthocentre, the incentre and the circumcentre of the triangle ABC are collinear.
2. The orthocentre of the triangle lies inside the triangle.

[Stuart@KaplanGMAT]

Is triangle ABC an acute-angled triangle ?

1. The orthocentre, the incentre and the circumcentre of the triangle ABC are collinear.
2. The orthocentre of the triangle lies inside the triangle.

You don't need to know this terminology on the GMAT.

Where is this question from? Including the source of all the questions you post makes it much easier for people to help out.

[amitansu]

This is a data-sufficiency question from one of the test-prep books,
that concentrates the Common admission Test conducted by top Indian management institutes.

If it does n't fit into GMAT category then we can ignore.

[Stuart@KaplanGMAT]

This is a data-sufficiency question from one of the test-prep books,
that concentrates the Common admission Test conducted by top Indian management institutes.

If it does n't fit into GMAT category then we can ignore.

Definitely outside the scope of the GMAT.