½ (diagonal x sum of altitudes drawn on the diagonal from other two vertices) is the formula of area of:
a)trapezium b)quadrilateral c)square d)rectangle
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The altitude of a triangle is a perpendicular that is drawn from the vertex of a triangle to the opposite side. Since there are three sides in a triangle, three altitudes can be drawn in it. Different triangles have different kinds of altitudes. The altitude of a triangle which is also called its height is used in calculating the area of a triangle and is denoted by the letter 'h'.
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