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3 years ago

Find the area of a regular decagon with radius 7 cm. Round to the nearest tenth. Please help

Mathematics

1 answer:

Vanyuwa [196]3 years ago

8 0

<h2>Answer:</h2>

144 cm squared

<h2>Step-by-step explanation:</h2>

The steps are same as for the calculation of area of the octagon I solved for you earlier. That is why I will post here only calculations and not the actual steps.

360/10=36 degrees

36/2=18 degrees

sin(18)=x/7

x= 2.1631 cm

Cos(18)=y/7

y=6.6573

y*x= 14.4006

14.4006*10=144 cm squared

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