Question

pls answer this question ​

Answer 1

Answer:

9. - trial and error method

10. - d.......... 75 degree

Answer 2

$\boxed{ \mathsf \blue{sum \: of \: angles \: in \: a \: quadrilateral \: = \: 360°}}$

$\mathsf \red{let \: the \: unknown \: angle \: be \: \: \: x°} \\ \\ \mathsf{100 °+ 75° + 110° + x °= 360°} \\ \\ \mathsf{285 °+ x° = 360°} \\ \\ \mathsf{x = 360° - 285°} \\ \\ \mathsf{x = 75°} \\ \\ \mathsf \red{ \therefore \: the \: unknown \: angle \: is \: \: 75°}$

$\mathsf{}$

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