Equilateral - All angles are the same (60 deg) and all sides are the same
Right angled - one of the angles is 90 deg
Scalene - none of the angles or sides are the same
Finding angles in a triangle
There are two key facts to know about angles in triangles:
1. All the angles in a triangle add up to 180 deg
A + B + C = 180
Everything else is just adding and subtracting. Make sure to use your calculator in order to avoid silly mistakes.
2. All the angles on a straight line add up to 180 deg
A + B + C = 180
Useful Triangle Constructions
If you draw a triangle inside a semi-circle with the diameter as the hypotenuse (long edge), there is always a 90 deg angle in the corner that touches the semi-circle
How to do it - Questions with Right Angled Triangles
2012 Q13
Find the midpoint of the base of the triangle
Draw a semi-circle with the base as the diameter and midpoint as the centre
Project up from the bottom of the boat to find the top corner of the windscreen