Maths Monster
GR.8.6

Find unknown angles and sides in congruent shapes

Use congruence to work out unknown angles and sides

1 hand-picked video lesson for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.

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Grade 3–6 Core 🇺🇸 US

Geometry - How to Determine the Missing Values with Congruent Triangles

Brian McLogan 51K views

Find unknown sides and angles by matching the corresponding parts of congruent triangles.