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ladessa [460]
3 years ago
8

The diagram shows a regular octagon joined to an equilateral triangle work out the value of X

Mathematics
1 answer:
fgiga [73]3 years ago
5 0

Answer:

x=165^o

Step-by-step explanation:

we know that

The measure of the interior angle in an equilateral triangle is equal to 60 degrees

The measure of the interior angle in a regular octagon is equal to

\frac{(n-2)180}{n}

where

n is the number of sides

In this problem we have

n=8\ sides

substitute

\frac{(8-2)180}{8}

\frac{(6)180}{8}=135^o

we have that, based in the diagram

The sum of the interior angle of the equilateral triangle plus the interior angle of a regular octagon plus the value of x must be equal to 360 degrees (complete circle)

so

x+60^o+135^o=360^o

solve for x

x+195^o=360^o

x=360^o-195^o

x=165^o

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