Question

Given a $△$ABC, and the sum of two angles of the triangle is 90${}^{\circ }$. What type of triangle is it? [2 MARKS]

Answer 1

Triangle: 2 Marks

Given that:
The sum of two angles of the triangle is 90${}^{\circ }$.
We know that the sum of all the three angles in a triangle is 180${}^{\circ }$.

$\therefore$ The other angle = 180-90 = 90${}^{\circ }$
Now we know that if one of the angles in a triangle is 90${}^{\circ }$, then the triangle is a right-angled triangle.
Hence, the given triangle is a right-angled triangle.