Question

the angles of a quadrilateral are 3 X (2 X + 20 degree) and (5 x - 40 degree ) .find the angles has show that the Triangles is an equilateral triangle​

Answer 1

Answer:

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Step-by-step explanation:

3x+(2x+20)+(5x-40)=180

3x+2x+20+5x-40=180

10x-20=180

10x=180+20

10x=200

x=20

All the angles are :

3x=3×20=60

2x+20=2×20+20=40+20=60

5x-40=5×20-40=100-40=60

All the angles are of 60° therefore it is an equilateral triangle.

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