Interior angles in a triangle add up to 180˚. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to a ...
The parallel sides of a trapezium are labelled 𝒂 and 𝒃. The perpendicular height is the shortest distance between the parallel sides and is labelled 𝒉. Calculating the area of a trapezium is a ...
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