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If opposite angles of a rhombus are (2x)° and (3x – 40)°, then the value of x is ____. (A) 100° (B) 80° (C) 160° (D) 40°

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If opposite angles of a rhombus are (2x)° and (3x – 40)°, then the value of x is ____. 

(A) 100° 

(B) 80° 

(C) 160° 

(D) 40°

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Best answer

(D) 40°

2x = 3x – 40 … [Pythagoras theorem] 

∴ x = 40° 

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