Polygon: A two-dimensional shape with straight sides.
Isosceles triangle: A triangle with two equal sides.
Equilateral triangle: A triangle with all three sides of equal length. All the angles are 60° .
Isosceles Triangle: A triangle with two angles the same size and two angles the same size
Right-angled triangle: A triangle with a right angle
Frequency: the number of times a data value occurs
Sector: Part of a circle made by two radii touching the centre
Protractor: Equipment used to measure angles
Compass: Equipment used to draw arcs and circles