Mark ( ) against the correct answer: In a , If =40^ and =35^ , th… - Vidyadip

MCQ

Mark $(\checkmark)$ against the correct answer: In a $\triangle\text{ABC},$ If $\angle\text{B}=40^\circ$ and $\angle\text{C}=35^\circ,$ then $\angle\text{A}=?$

A
$50^\circ$
B
$55^\circ$
✓
$105^\circ$
D
$150^\circ$

✓

Answer

Correct option: C.

$105^\circ$

$\angle\text{A}+\angle\text{B}+\angle\text{C}=180^\circ$
$\Rightarrow\angle\text{A}=180^\circ-(40^\circ+35^\circ)$
$\Rightarrow\angle\text{A}=105^\circ$

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