2x + 10 + 2x + 90^∘ = 180^∘ nbsp;(Sum of all the angles of a triangle is 180^∘) 2x + 10 + 2x = 90 4x = 90 10 4x = 80 x = 20^∘ So, option D is the correct an ...

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Standard X

Mathematics

Method of Substitution to Find the Solution of a Pair of Linear Equations

Find the valu...

Question

Find the value of x.

25^{\circ}

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22^{\circ}

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20^{\circ}

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21^{\circ}

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Solution

The correct option is C $20^{\circ}$
$2 x + 10 + 2 x + 90^{\circ} = 180^{\circ}$ (Sum of all the angles of a triangle is $180^{\circ})$
$2 x + 10 + 2 x = 90$
$4 x = 90 - 10$
$4 x = 80$
$x = 20^{\circ}$
So, option $D$ is the correct answer.

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Find the value of x.

The correct option is C 20∘2x+10+2x+90∘=180∘ (Sum of all the angles of a triangle is 180∘) 2x+10+2x=90 4x=90−10 4x=80 x=20∘ So, option D is the correct answer.

The correct option is C $20^{\circ}$
$2 x + 10 + 2 x + 90^{\circ} = 180^{\circ}$ (Sum of all the angles of a triangle is $180^{\circ})$
$2 x + 10 + 2 x = 90$
$4 x = 90 - 10$
$4 x = 80$
$x = 20^{\circ}$
So, option $D$ is the correct answer.