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 Form 2 Mathematics online video lessons on trigonometric ratios

In triangle XYZ, XY = XZ = 4.1 cm, XN is the altitude of the triangle, which is 3.2 cm long. Calculate:
(a) the base angles of the triangle.
(b) the size of the vertex angle.
(c) area of triangle XYZ.

 (6m 30s)
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