If you can learn the following rules then you’re life is going to a lot easier….well….at least during your maths exam.
Angles In A Triangle Add Up To 180°So angles A + B + C = 180°
The Exterior Angle Of A Triangle Equals The Sum Of The Opposite Interior AnglesSo angle D = A + C
Angles On A Straight Line Add Up To 180°So A + B + C = 180°
Angles In a Quadrilateral (4 Sided Shape) Add Up To 360°So here x must be 100°
Angles Around A Point Ad Up To 360°
So a + b + c = 360°
Isosceles Triangles Have 2 Sides And 2 Angles The SameThe two dashes show the two sides are the same length.
The angles marked are the same.