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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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3 years ago

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3 years ago

On section AB, whose length is 192 cm, take the point C so that AC: CB = 1: 3. The point D is taken on the AC section so that CD

jasenka [17]

Answer:

112 cm

Step-by-step explanation:

<u>Given:</u>

AB = 192 cm
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The distance between midpoints of AD and CB = x

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AC + CB = AB
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<u>Find the midpoint of AD:</u>

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<u>Find the distance between the midpoints:</u>

x = 130 - 18 = 112 cm

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2 years ago