The sum of two angles is $180 °$ . If one angle is $100 °$ , then the other is ____.

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Solution

Let two angles are $∠ A, ∠ B$
$∠ A = 10 \begin{array}{rcl} 0 \end{array} \begin{array}{rcl} ° \end{array}$ (given)
$\begin{array}{rcl} ∠ A + ∠ B & = & 180 ° \\ 100 ° + ∠ B & = & 180 ° \\ ∠ B & = & 80 ° \end{array}$
Hence, The second angle is $80 °$ .

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The sum of two angles is 180°. If one angle is 100°, then the other is ____.

Let two angles are ∠A,∠B∠A=100°(given)∠A+∠B=180°100°+∠B=180°∠B=80°Hence, The second angle is 80°.

The sum of two angles is $180 °$ . If one angle is $100 °$ , then the other is ____.

Let two angles are $∠ A, ∠ B$
$∠ A = 10 \begin{array}{rcl} 0 \end{array} \begin{array}{rcl} ° \end{array}$ (given)
$\begin{array}{rcl} ∠ A + ∠ B & = & 180 ° \\ 100 ° + ∠ B & = & 180 ° \\ ∠ B & = & 80 ° \end{array}$
Hence, The second angle is $80 °$ .