Mathematics

# In figure, $a=40^o$. The value of $b$ is

$20^o$

##### SOLUTION
We can clearly see that, $5b$ and $2a$ are linear angles
And $a=40^0$
$\Rightarrow 5b+2a=180^o$
$\Rightarrow 5b+2\times 40^o =180^o$
$\Rightarrow 5b+80^o =180^o$
$\Rightarrow 5b=100^o$
$\Rightarrow b=\dfrac{100^o}{5}$
$\Rightarrow b=20^o$
So, option $A$ is correct

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Single Correct Medium Published on 09th 09, 2020
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