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The Winter Triangle meets the 'Mars Triangle' in the night sky this month
For the next few weeks, the planet Mars will form an isosceles triangle with the two bright stars marking the heads of the ...
BBC4 年
Angles, lines and polygons - AQA
A trapezium has rotational symmetry of order one. Some trapeziums have one line of symmetry. They are called isosceles trapeziums as they have 2 sides of an equal length like isosceles triangles.