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Find the area of the triangle to the nearest tenth.

 

Image wont upload but sides are 4 cm (left side), 7 cm (right side), 9 cm (bottom) of triangle. 

 Mar 2, 2021
 #1
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Heron's formula states that the area of a triangle whose sides have lengths a, b, and c is

A =   sqrt (   s ( s − a ) ( s − b ) ( s − c ) )

where s is the semi-perimeter of the triangle; that is,

s = (a + b + c) /2

 

sooooo    s = ( 4 + 7 + 9)/2 = 10

 

then  Area = sqrt  [ 10 ( 10-4) (10-7) (10-9)  ]               I believe you can finish tis now     cheeky

 Mar 2, 2021
 #2
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Yeah, thank you!

Guest Mar 2, 2021

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