Question
If the area of a triangle is 1920 cm2 and
base: corresponding altitude is 3:5, then the altitude of the triangle is:Solution
Using the formula, Area of the triangle = 1/2 x base x height Let the base and altitude be 3x and 5x respectively. According to question, ⇒ 1/2 x base × altitude = 1920 cm2 or, ⇒ 1/2 x (3x) x (5x) = 1920 ⇒ 15x2 = 3840 ⇒ x2 = 3840/15 ⇒ x2 = 256 ⇒ x = √256 ⇒ x = 16 cm Altitude of a triangle = 5x = 5 × 16 cm = 80 cm
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