Trapezium: finding a missing length
Mathematics · Grade 10 · about 40 minutes
Given the area of a trapezium and three of a, b, h, rearrange half (a + b) times h to find the missing one.
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- 1 practice task with hints and worked answers
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- Regular polygons and composite shapes
- Perpendicular height, not the slant
- Triangle area from two sides and the included angle
- Heron's formula: three sides, no height
- Area of a parallelogram from sides and an angle
- Rhombus: base times height, or half the diagonals
- Area of a kite
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- A regular polygon as n isosceles triangles
- Frames, paths and holes: subtract to add
- Irregular polygons by triangulation
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