Two right-angled triangles are joined together as shown to form triangle X. If triangle X is isosceles, give a possible value of length a. Step 1: Redraw triangle X with the known measurements Step 2: Try possible values of a Isosceles triangles have exactly two equal-length sides Equilateral triangles have three equal-length sides So a possible answer is that a could be 25 centimetres. 8 cm 8 cm Play the video for more details​