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23 May, 07:24

A, B & C form a triangle where BAC = 90°. AB = 7.3 mm and CA = 7.4 mm. Find the length of BC giving your answer rounded to 1 DP.

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  1. 23 May, 07:36
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    BC ≈ 10.4 mm (1 decimal)

    Step-by-step explanation:

    The question forms a right angle triangle. The angle BAC = 90°. The side AB = 7.3 mm and the side CA = 7.4 mm. The length of BC can be solved below.

    AC = opposite side = 7.4 mm

    AB = adjacent side = 7.3 mm

    BC = hypotenuse = ?

    Using pythagoras theorem we can find the longest side which is the hypotenuse

    c² = a² + b² (pythagoras formular)

    where

    c = hypotenuse side

    BC² = 7.4² + 7.3²

    BC² = 54.76 + 53.29

    BC² = 108.05

    square root both sides

    BC = √108.05

    BC = 10.3947101931

    BC ≈ 10.4 mm (1 decimal place)
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