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