Remember that the interior angles of a triangle add up to 180º.
A right-angled triangle has one 90º angle
An isosceles triangle has two equal angles
An equilateral triangle has three equal angles, each of size 60º
Two of the angles in a triangle are 35º and 110º. Which type of triangle is it?
We must first work out the third angle which will be:
180º - (35º + 110º) = 180º - 145º = 35º
So the triangle has angles 35º , 110º, 35º
Two angles are equal so it is isosceles.