Find the area of an equilateral triangle (regular 3-gon) with the given measurement. 3-inch radius

A = sq. in.

Question

Find the area of an equilateral triangle (regular 3-gon) with the given measurement. 3-inch radius

A = sq. in.

paxpolaris · Answer

radius??

paxpolaris · Answer

is the triangle inside a circle? ... or do you mean length of side

anonymous · Answer

i mean your suppost to find the area

anonymous · Answer

@PaxPolaris i dont know :/

anonymous · Answer

@PaxPolaris It's an odd question I know, but it's asking about this: http://www.mathopenref.com/polygonradius.html The radius of a regular polygon is the distance from the center to any vertex

paxpolaris · Answer

cool... gotcha

anonymous · Answer

$$radius = \frac{side}{2\sin \frac{180}{number of sides}}  $$

anonymous · Answer

so whats the answer? im sorry im really bad with math.

anonymous · Answer

We don't give out the answers, just the tools to help you solve it. Use the equation above and replace the "radius" and "number of sides" with their known values and solve for "side".

paxpolaris · Answer

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anonymous · Answer

|dw:1340320180942:dw|

paxpolaris · Answer

|dw:1340320107010:dw|

you can use the properties of 30-60-90 triangles to find the sides in black  and that will help you get base and height