Question

pls write the answer which i have marked step by step not direct answer​

Answer 1

I AM DOING Q.9. SO ANYONE WHO GIVES ANSWER AFTER ME THEN HE/SHE WILL GIVE THE ANSWER OF Q.8.

Answer:

SO , CONCEPT OF ANGLE SUM PROPERTY OF TRIANGLES AND LINEAR PAIR AND FOUR MAIN FUNDAMENTAL ARITHMETIC OPERATIONS.

Step-by-step explanation:

SO ,

ANGLE A + ANGLE ABD + ANGLE ADB = 180° (ANGLE SUM PROPERTY OF TRIANGLE )

• BY SUBSTITUTING THE VALUES OF ALL ANGLES GIVEN IN THE FIGURE , WE GET ,

x° + y° + 120° = 180°,

Now , x = 3y [GIVEN IN THE QUESTION ]

SO ,

3y + y = 180° - 120° [BY APPLICATION OF LINEAR EQUATION]

4y = 60°

y = 60° / 4

y = 15°

SO , x = 3y = 3 × 15 = 45° , y = 15°

NOW ,

ANGLE ADB + ANGLE BDC = 180° (LINEAR PAIR)

BY SUBSTITUTING ALL THE VALUES ,

120° + ANGLE BDC = 180°

180° - 120° = ANGLE BDC

60° = ANGLE BDC

SO ,

ANGLE BDC + ANGLE DBC + ANGLE DCB = 180° (BY APPLICATION OF LINEAR EQUATION)

BY SUBSTITUTING ALL THE VALUES ,

60° + z° + 80° = 180°

140° + z° = 180°

180° - 140° = z°

40° = z

THE VALUES OF z is 40° , x is 45° , y = 15°.

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