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Angle Sum Property

Find the valu...

Question

Find the value of X in the figure below:

A

60

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B

70

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C

80

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D

90

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Solution

The correct option is A
80

$∠$ A + $∠$ B + $∠$ C = 180 $^{\circ}$ (angle sum property)

⇒ 40 $^{\circ}$ + 60 $^{\circ}$ + $∠$ X = 180 $^{\circ}$
Therefore, $∠$ X = 80 $^{\circ}$

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Standard VII Mathematics