Question

hey mates ^_^
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∦ Two adjacent angles of a parallelogram are in the ratio 4:5.Find their measures ∦
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Answer 1

4x +5x = 180

9x = 180

x = 180/9

x = 20

Their measure,

4x = 4×20 = 80

5x = 5×20 = 100

Answer 2

Let the ratio be 5x and 4x

5x+4x=180° (linear pair)

9x=180°

x=180°/9

x=20°

• 4x=4×20=80°
• 5x=5×20=100°