Plane Geometry in A-Math isn’t as new or scary as it seems, it’s actually built on topics you’ve already seen in E-Math and lower sec math. You’ll recognise congruent and similar triangles (SSS, SAS, AA, etc.) and circle properties like tangent perpendicular radius and angles at the centre is twice angle at radius. Even angle rules in parallel lines, like alternate and interior angles, come back in plane geometry. The only two new things you really need to pick up are the Midpoint Theorem and Alternate Segment Theorem. So when you’re learning Plane Geometry, you’re also revising your E-Math — just with two more theorems.
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