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08-05-2022
Mathematics

contestada

A, B & C form a triangle where
∠
BAC = 90°.
AB = 8.4 mm and CA = 7 mm.
Find the length of BC, giving your answer rounded to 1 DP.

Respuesta :

idontdomaths idontdomaths

08-05-2022

Answer:

10.9

Step-by-step explanation:

Pythagoras theorem- a² + b² = c²

Since this is a right angle with each side on the right angle's length given you can use pythagoras theorem.

7² + 8.44² = c²

= 49 + 70.56 = c²

= 119.56 = c²

∴ c = √119.56

= 10.9

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