The ratio of the angles a and b of a rhombus abcd is 3 : 2, then the vaule of angle c is: select one: a. 118 b. 62 c. 72 d. 108
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d.108
explaination: let the angle of rhombus be x
3x+2x+3x+2x=360°-----sum of all angle of rhombus are 360° and opposite sides of rhombus are equal---(1)
10x=360°
x=360°/10
x=36°
substitute the value of x in (1)
3x=3×36=108°
2x=2×36=72°
a=c and b=d----opposite sides of rhombus---(2)
therefore a=108°----(2)
c=108°
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