Question : The orthocentre of an obtuse-angled triangle lies:

Option 1: Inside the triangle

Option 2: Outside the triangle

Option 3: On one side of a triangle

Option 4: None of these

Question : A point $p$ lying inside a triangle is equidistant from the vertices of the triangle. Then the triangle has P as its:

Option 1: Centroid

Option 2: Incentre

Option 3: Orthocentre

Option 4: Circumcentre

Question : The point equidistant from the vertices of a triangle is called its:

Option 1: Incentre

Option 2: Circumcentre

Option 3: Orthocentre

Option 4: Centroid

Question : The point where all three medians of a triangle meet is called:

Option 1: Centroid

Option 2: Incentre

Option 3: Circumcentre

Option 4: Orthocentre

Question : In an isosceles triangle, if the vertex angle is twice the sum of the base angle, then the measure of the half of the vertex angle of the triangle is:

Option 1: 60 

Option 2: 70 

Option 3: 80 

Option 4: 50