Question

How to find angles in triangle if we know one agnle?

Answer 1

SUPPOSE THERE IS A QUESTION LIKE ONE ANGLE OF A TRIANGLE IS 40° FIND THE
SECOND AND FIRST ANGLE

SOLUTION:-
LET THE TWO ANGLES BE X
SO SUM OF THREE ANGLES OF A TRIANGLE =180°
SO,40°+2x°+3x°=180°{HERE 2ND ANGLE ×x =2x & 3rd angle×x =3x}
40°+5x. =180°
5x. =180°-40°
5x. =140°
x. =140/5
x. =28°

SO, I.E. 2x = 2×x
=2×28°
2ND ANGLE =56°
&

3x. =3×x
=3×28°
3RD ANGEL =84°

NOW,AS WE KNOW THAT SUM OF THREE ANGLES OF A TRIANGLE=180°

SO,40°+2x°+3x°=180°
40°+56°+84°=180°

ANS:- THREE ANGLES OF THE TRIANGLE ARE:- 40°,56°&84°.