Question

Please help! tell me how to write the solution too! tysm (b sum)​

Answer 1

50°

Step-by-step explanation:

2x + 80 = 180

2x = 180 - 80 = 100

2x = 100

x= 100/2

x = 50

Answer 2

Given that : One of the angles of a triangle is 80° . If the other two angles are equal . Find its measure.

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$\color{purple}\:Explanation :$

Let the unknown (B and C) angles be x , since both of them are equal.

we know that , for a triangle

$\color{magenta} \: {\underline{\boxed{{\rm{ \angle\:A + \angle\:B + \angle \:C = 180 °}}}}}$

Now , substitute the angles

$\bf\fbox\red{80 + x + x = 180}$

$\bf\fbox\red{80 + 2x = 100}$

$\bf\fbox\red{2x = 180 - 80}$

${\underline{\boxed{{\rm{x = \frac{100}{2}}}}}}$

${\underline{\boxed{{\rm{x = 50}}}}}$

Therefore the measure of unknown angle is 50°

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