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Answers
Answer:
Answer Of 5. (ii) Obtuse Angle
Answer:
Ques 5:
(I) acute
no because acute angles are less than 90° and there are no such acute angles whose sum is 180°.
(ii) obtuse
no because of both the angles are obtuse then the sum would be more than 180°
(iii) right angle
yes because the sum of 90°+90° is 180° which is a supplementary angle.
Ques 7:
let first angle = (2x-10)
second angle = (3x+20)
we know that straight line angle = 180°
AtoQ
(2x-10)+(3x+20)=180°
2x-10+3x+20=180°
(2x+3x)+(-10+20)=180°
5x+10=180°
5x=180°-10°
5x=170°
x=170°/5
x=34°
angle 1=2*34-10=58°
angle 2=3*34+20=122°
VERIFICATION:
put x=34°
(2x-10)+(3x+20)=180°
(2*34-10)+(3*34+20)=180°
58°+122°=180°
180°=180°
LHS=RHS
so x=34° satisfies the equation.
Explanation:
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