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fgiga [73]
3 years ago
5

Find the area of a regular decagon with radius 4 cm

Mathematics
2 answers:
bazaltina [42]3 years ago
8 0
A =  \frac{5}{2}t^{2} \sqrt{5 + 2 \sqrt{5} }

A =  \frac{5}{2} (4)^{2}  \sqrt{5 + 2(2.236067978)} }

A =  \frac{5}{2} (16) \sqrt{5 + 4.472135956}

A =  40 \sqrt{9.472135956}

A = 40(3.077683537)

A = 123.1073415cm^{2}

emmasim [6.3K]3 years ago
5 0

The area is 123.1073415 cm
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