B.4 Geometry and trigonometry

Recognise angles and shapes in regular two- and three-dimensional structures, including molecular shapes and bond angles.

Use b.4.1—angles and regular structures to connect the rule to the data and decision in the question.

This matters because b.4.1—angles and regular structures determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.4.1—angles and regular structures to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: B.4.1—Angles and regular structures is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.

Visualise and represent two- and three-dimensional forms, including drawing isomers. Identifying chiral centres from such representations is an A2 application.

Use b.4.2—representing two- and three-dimensional forms to connect the rule to the data and decision in the question.

This matters because b.4.2—representing two- and three-dimensional forms determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.4.2—representing two- and three-dimensional forms to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: B.4.2—Representing two- and three-dimensional forms is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.

Understand the symmetry of two- and three-dimensional shapes. Identifying chiral centres from representations is an A2 application.

Use b.4.3—symmetry of shapes to connect the rule to the data and decision in the question.

This matters because b.4.3—symmetry of shapes determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.4.3—symmetry of shapes to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: B.4.3—Symmetry of shapes is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.