Geometric Reasoning (Year 7)

Vertically Opposite: Angles formed when two or more straight lines cross at a point

Interior Angles: Angles inside the shape

Sum: total, add all the interior angles together

Convex Quadrilateral: A four-sided polygon where every interior angle is less than 180 degree

Concave Quadrilateral: A four-sided polygon where one interior angle exceeds 180 degree

Polygon: A 2D shape made with straight lines

Scalene triangle: A triangle with all different sides and angles

Isosceles triangle: A triangle with two lengths the same size and two angles the same size.