Asked by angela
What is the area of a decagon with a side length of 4cm?
Answers
Answered by
Reiny
You would have 10 congruendt isosceles triangles,
each with a top angle of 36° , and equal base angles of
72°
We need the height:
height/2 = tan 72°
height = 2tan72°
area of each triangle = (1/2)base x height
= (1/2)(4)(2tan72°) = 4tan72°
so area of decagon = 10(4tan72°) = ....
you do the button-pushing.
each with a top angle of 36° , and equal base angles of
72°
We need the height:
height/2 = tan 72°
height = 2tan72°
area of each triangle = (1/2)base x height
= (1/2)(4)(2tan72°) = 4tan72°
so area of decagon = 10(4tan72°) = ....
you do the button-pushing.
Answered by
Anonymous
4cm
Answered by
bobs uncle
so sussy balls
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