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What is the area of  to the nearest tenth of a square centimeter? Use special right triangles to help find the height. 

 

jbouyer  May 16, 2017

Best Answer 

 #1
avatar+7324 
+2

This is a 30º-60º-90º triangle where the length of the side across from the 30º angle = 5 cm.

 

So...the length of the side across from the 60º angle = 5√3 cm.

 

area of triangle = (1/2)(base)(height)

area of triangle = (1/2)(5)(5√3 )  cm2

area of triangle = 12.5√3           cm2

area of triangle ≈ 21.7               cm2

hectictar  May 16, 2017
 #1
avatar+7324 
+2
Best Answer

This is a 30º-60º-90º triangle where the length of the side across from the 30º angle = 5 cm.

 

So...the length of the side across from the 60º angle = 5√3 cm.

 

area of triangle = (1/2)(base)(height)

area of triangle = (1/2)(5)(5√3 )  cm2

area of triangle = 12.5√3           cm2

area of triangle ≈ 21.7               cm2

hectictar  May 16, 2017

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