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[tex] \large \red{ \underline{ \underline{ \green{ \rm \: solution : }}}}[/tex]
1 triangle :-
[tex] \large \: \: \: \: \: \: \: \: \rightarrow \orange{ \boxed{ \pink{ \rm \: angle \: sum \: property}}}[/tex]
Angles of triangle ABC
[tex]\bigstar[/tex] Sum of all interior angle of triangle = 180°
[tex]\rightarrow[/tex] let finding angle be = x
[tex]\implies[/tex] x + 90 ° + 40° = 180°
[tex]\implies[/tex] x + 130° = 180°
[tex]\implies[/tex] x = 180° - 130°
[tex]\implies[/tex] x = 50°
[tex] \large \therefore \blue{ \boxed{ \purple{ \rm \:3rd \: \: angle =50 \degree }}}[/tex]
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2 triangle
[tex] \large \: \: \: \: \: \: \: \: \rightarrow \orange{ \boxed{ \pink{ \rm \: angle \: sum \: property}}}[/tex]
Angles of triangle PQR
[tex]\bigstar[/tex] Sum of all interior angle of triangle = 180°
[tex]\rightarrow[/tex] let finding angle be = y
[tex]\implies[/tex] y + 35° + 30° = 180°
[tex]\implies[/tex] y + 65° = 180°
[tex]\implies[/tex] y = 180° - 65°
[tex]\implies[/tex] y = 95°
[tex] \large \therefore \green{ \boxed{ \red{ \rm \:3rd \: \: angle =95 \degree }}}[/tex]
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3 triangle
[tex] \large \: \: \: \: \: \: \: \: \rightarrow \orange{ \boxed{ \pink{ \rm \: angle \: sum \: property}}}[/tex]
Angles of triangle LMN
[tex]\bigstar[/tex] Sum of all interior angle of triangle = 180°
[tex]\rightarrow[/tex] let finding angle be = z
[tex]\implies[/tex] z + 35° + 62° = 180°
[tex]\implies[/tex] z + 97° = 180°
[tex]\implies[/tex] z = 180° - 97°
[tex]\implies[/tex] z = 83°
[tex] \large \therefore \purple{ \boxed{ \orange{ \rm \:3rd \: \: angle =83 \degree }}}[/tex]